id: 96 yr ( 2, (2, 0, 0, 0)) (( 0.2, 0.3 ), ( 0.8, 0.6 ))
 +1 |                 +1 
  |                  
  2011               2012  
  +    +    +    +   
  |                  
  |                  
  |                 
  |                  
  +    +    +    +   
  |                  
  |                  
  |                  
  |                  
  +    +    +    +   
  |                  
  |                  
  |                  
  |                  
 0-+----+----+----+--