        2013  2014     16        
          16                                                                                                                                                               
          8                                                                 
          4                                    
                                                                          
                                  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
             