Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1808      1738      15.618516  16.921549  16.313666  0.312989   16.336209 
2008            1808      1738      13.387065  14.876451  14.174715  0.361519   14.192371 
2009            1808      1738      13.827419  15.311096  14.574694  0.340971   14.592887 
2010            1808      1738      13.601322  14.742839  14.213663  0.278636   14.23571  
2011            1808      1738      14.212839  15.700291  14.900534  0.335588   14.899888 
2012            1808      1738      15.862935  16.878839  16.427695  0.235139   16.450742 
2013            1808      1738      14.716904  16.263903  15.544655  0.363111   15.56708  
2014            1808      1738      13.77442   14.906581  14.373557  0.258022   14.399387 
2015            1808      1738      16.795065  17.755936  17.335546  0.227462   17.345194 
2016            1808      1738      15.138161  16.430355  15.83918   0.324786   15.856597 
2017            1808      1738      14.266935  15.385839  14.88985   0.268817   14.918291 
2018            1808      1738      13.238742  14.350194  13.838436  0.247019   13.850049 
2019            1808      1738      13.723742  14.745677  14.256694  0.234193   14.253323 
2020            1808      1738      12.99271   14.012838  13.567945  0.230494   13.592984 
2021            1808      1738      16.753775  17.577549  17.186797  0.189231   17.194597 
2022            1808      1738      14.143904  15.072452  14.627626  0.195729   14.615565 
2023            1808      1738      12.734134  14.184967  13.627534  0.324913   13.695933