Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            598       598       19.727097  20.873678  20.366136  0.310228   20.404032 
2008            598       598       21.154129  22.115644  21.859908  0.239652   21.966001 
2009            598       598       18.804743  20.140322  19.530412  0.325527   19.607323 
2010            598       598       21.886774  22.67371   22.419897  0.155951   22.470419 
2011            598       598       20.944839  22.162773  21.658642  0.287981   21.739274 
2012            598       598       21.720774  23.134291  22.656752  0.345674   22.778968 
2013            598       598       21.659935  22.96542   22.275419  0.318684   22.243726 
2014            598       598       19.874903  21.160709  20.647338  0.297623   20.740322 
2015            598       598       20.482161  21.78771   21.095967  0.310839   21.080258 
2016            598       598       20.636387  22.236065  21.487612  0.39736    21.568081 
2017            598       598       20.497322  21.976032  21.359831  0.365442   21.427823 
2018            598       598       21.173935  22.12487   21.863413  0.236655   21.961886 
2019            598       598       21.171162  22.470839  22.00459   0.32474    22.131759 
2020            598       598       21.587774  22.821871  22.193184  0.282493   22.259774 
2021            598       598       20.554226  21.631645  21.176449  0.23608    21.257903 
2022            598       598       21.689161  22.675549  22.394376  0.225021   22.478871 
2023            598       598       22.480387  23.540871  23.20981   0.243975   23.314355