Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1706      1017      16.91642   17.994709  17.449768  0.25751    17.422838 
2008            1706      1017      15.261709  16.470194  15.881492  0.264204   15.878    
2009            1706      1017      15.144096  16.45116   15.800483  0.290992   15.79671  
2010            1706      1017      14.758549  15.850806  15.30582   0.241159   15.299    
2011            1706      1017      15.461678  16.638193  16.049497  0.260794   16.040323 
2012            1706      1017      16.762259  17.766064  17.26811   0.229933   17.262194 
2013            1706      1017      15.113935  16.461742  15.802779  0.317232   15.784549 
2014            1706      1017      15.597903  16.436451  16.039903  0.174138   16.047613 
2015            1706      1017      17.706451  18.421644  18.079589  0.152092   18.084549 
2016            1706      1017      16.014387  17.099096  16.569082  0.234127   16.582193 
2017            1706      1017      15.521935  16.475161  15.984306  0.194962   15.991936 
2018            1706      1017      14.046162  14.952258  14.512693  0.198158   14.525774 
2019            1706      1017      14.655548  15.790129  15.104606  0.237992   15.073483 
2020            1706      1017      13.81429   14.695807  14.240152  0.181268   14.247903 
2021            1706      1017      17.523355  18.447838  17.902207  0.196109   17.85784  
2022            1706      1017      14.978613  16.089096  15.519325  0.259061   15.491451 
2023            1706      1017      13.2169    14.497766  13.912902  0.269255   13.936466