Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       393       16.088161  16.890774  16.526743  0.231171   16.571291 
2008            435       393       12.173194  12.94829   12.582346  0.189772   12.587322 
2009            435       393       12.770774  13.627871  13.237467  0.206234   13.238709 
2010            435       393       12.642936  13.537065  13.107241  0.233641   13.108355 
2011            435       393       14.024451  15.044903  14.600097  0.267717   14.630516 
2012            435       393       14.894387  15.762677  15.380022  0.224515   15.410807 
2013            435       393       13.133549  14.303323  13.696206  0.292433   13.679709 
2014            435       393       14.571677  15.762065  15.263841  0.293048   15.288387 
2015            435       393       15.582129  16.404032  16.091611  0.199887   16.116032 
2016            435       393       14.378387  15.267612  14.879528  0.206523   14.886387 
2017            435       393       13.413645  14.768258  14.074597  0.345706   14.064871 
2018            435       393       13.775517  14.662     14.250556  0.223792   14.257774 
2019            435       393       16.403387  16.922871  16.749383  0.115217   16.774839 
2020            435       393       15.917258  17.643871  16.817604  0.429197   16.82987  
2021            435       393       16.601225  18.79171   17.720672  0.570506   17.75313  
2022            435       393       15.025968  15.70171   15.430701  0.16889    15.466452 
2023            435       393       15.653677  16.737387  16.23278   0.309029   16.270193