     ·          
  
  1.        2009  
  2.     2010  
  3.        2011 
  4.         2012 
                 
         
             
        
    
        
 1. 
            
 2.  
         
 3.  
         
                
     
1.      2.      3.     
      
        
1 3         4 6           7 10         11 15        
           
      
1.   2.    3.   
        
            
    
         
            
        