id: 10 yr ( 8, (2, 0, 0, 6)) (( 2.5, 2.3 ), ( 6.2, 1.4 ))
 +10+    +    +    +    +  +3 
                |        
                |     2012  
                |        
                |        
 +    +    +    +  2013 +   
                |        
                |        
                |        
                |        
 +    +    +    +    +   
             2015  2016        
                |        
          2014    |        
                |        
 +    +    +    +    +   
          2017     |        
                |        
                |        
                |        
 +    +    +    +    +   
                |        
     2011          |        
                |        
  2018             |        
 +    +    +    +    +   
                |        
                |        
                |        
                |        
 0+----+----+----+----+---5