Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1706      1017      18.453678  18.815258  18.632958  0.074253   18.630419 
2008            1706      1017      17.350807  17.691967  17.510769  0.098779   17.502258 
2009            1706      1017      18.727097  19.08371   18.899699  0.071506   18.892548 
2010            1706      1017      14.756419  15.122742  14.941193  0.069581   14.944742 
2011            1706      1017      19.75071   20.234581  20.067379  0.105844   20.062677 
2012            1706      1017      20.788742  21.075516  20.945573  0.065486   20.946581 
2013            1706      1017      16.094742  16.473289  16.288029  0.090775   16.294775 
2014            1706      1017      15.226129  15.559096  15.422489  0.064811   15.437677 
2015            1706      1017      17.610806  18.142902  17.924818  0.120157   17.933743 
2016            1706      1017      18.584581  19.144646  18.874247  0.158168   18.930387 
2017            1706      1017      19.584871  19.967968  19.806135  0.071174   19.820419 
2018            1706      1017      19.30958   19.725065  19.555607  0.098918   19.546162 
2019            1706      1017      16.609419  17.252548  16.954944  0.132348   16.979322 
2020            1706      1017      20.409033  20.709612  20.595957  0.08421    20.620033 
2021            1706      1017      17.604677  17.963839  17.770369  0.082911   17.754387 
2022            1706      1017      17.25071   17.614355  17.454019  0.075126   17.45142  
2023            1706      1017      20.518452  21.069355  20.863756  0.144692   20.89242