Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            6786      5027      15.835871  18.213646  17.280616  0.440588   17.322805 
2008            6786      5027      15.555323  17.560322  16.91002   0.374821   16.997387 
2009            6786      5027      16.306     18.793484  17.923716  0.500217   18.010935 
2010            6786      5027      16.756935  19.23871   18.324165  0.494725   18.398355 
2011            6786      5027      17.906033  19.518452  18.974098  0.238583   19.02829  
2012            6786      5027      17.847485  19.857485  19.092584  0.382646   19.14542  
2013            6786      5027      16.17671   18.33371   17.567504  0.412084   17.616613 
2014            6786      5027      16.51358   18.990065  18.090463  0.505401   18.181322 
2015            6786      5027      17.490387  19.880646  18.911197  0.359848   18.892517 
2016            6786      5027      15.581645  17.839838  16.879788  0.40699    16.881903 
2017            6786      5027      16.470129  19.229517  18.211731  0.493806   18.270613 
2018            6786      5027      17.624678  20.672451  19.386777  0.495818   19.37816  
2019            6786      5027      18.52529   21.637161  20.291622  0.502021   20.266935 
2020            6786      5027      15.559968  17.802999  16.643299  0.441047   16.55887  
2021            6786      5027      17.390549  19.68784   18.593702  0.333268   18.570097 
2022            6786      5027      16.194452  19.49258   18.06108   0.545736   18.087387 
2023            6786      5027      17.096613  19.427355  18.179692  0.385342   18.084839