                                                                                  
   
                                                                                                                                               24           51                   70    20           20                                                                                                                      
   
         1970             47                                                                                                                          
   
    1968                                                                                                                                                                          
 
                                                                                                                                           /           /                                                                                                                                                                                                                                               20                                                             
   
                                                                        
   
                                                                                                                                                                                            
 
                                                                                                                                                   
   
                                                                                                                                                                                      

                                                                                                                                     
   
                                                                                 
   
              9                                                                                                                               
   
                                                                              
  
                    