Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1060      930       20.999966  21.332533  21.190251  0.050549   21.206117 
2008            1060      930       21.569067  22.125601  21.965852  0.137559   22.02085  
2009            1060      930       20.652866  21.225599  20.941523  0.126085   20.963    
2010            1060      930       20.736967  21.3904    21.198416  0.164103   21.243899 
2011            1060      930       22.599483  23.103207  22.905424  0.140733   22.938449 
2012            1060      930       24.157101  24.349501  24.242523  0.04154    24.24025  
2013            1060      930       19.854     20.311001  20.15238   0.115306   20.196834 
2014            1060      930       20.187     20.65      20.466199  0.118749   20.492233 
2015            1060      930       21.868799  22.3853    22.205231  0.125233   22.231017 
2016            1060      930       21.948866  22.344067  22.188553  0.095077   22.216033 
2017            1060      930       23.259666  23.587067  23.463251  0.098633   23.490983 
2018            1060      930       21.641733  21.986633  21.787536  0.067098   21.794184 
2019            1060      930       20.988966  21.348833  21.214051  0.108531   21.240783 
2020            1060      930       23.059099  23.5054    23.320969  0.107262   23.341984 
2021            1060      930       21.083534  22.381067  21.716582  0.269178   21.704116 
2022            1060      930       21.828199  22.177433  22.048918  0.092541   22.073883 
2023            1060      930       22.253206  22.865965  22.511795  0.148475   22.495087