id: 16 yr ( 9, (6, 0, 2, 1)) (( 4.0, 4.0 ), ( 4.6, 1.6 ))
 +11          |                    +8 
           |                     
           |                  2012  
 +    +    +    +    +    +    + 
           |                     
           |                     
           |                     
           |             2017       
 +    +    +    +    +    +    + 
           |                     
           |                     
           |                     
           |        2013  2018         
 +    +    +    +    +    +    + 
           |                     
           |                     
           | 2014                   
           |                    
 +    +    +    +    +    +    + 
           |                     
           |                     
           2019                     
           |                     
 +    +    +    +    +    +    + 
           |                     
           |                     
    2016      |                     
           |                     
-+--2020-+----+----+----+----+----+-
           |                     
  2015        |                     
           |                     
 -1          |                    -5