Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            598       592       21.945566  22.375834  22.134556  0.123827   22.1032   
2008            598       592       22.313267  22.516966  22.398152  0.037367   22.394933 
2009            598       592       22.093666  22.871834  22.515725  0.236248   22.504017 
2010            598       592       21.475466  22.099934  21.816045  0.172626   21.756267 
2011            598       592       23.151758  23.945587  23.55038   0.218954   23.544172 
2012            598       592       23.904167  24.1656    24.051024  0.069805   24.074334 
2013            598       592       20.604733  21.080799  20.882255  0.120411   20.841784 
2014            598       592       19.737467  20.120899  19.872103  0.082447   19.847266 
2015            598       592       21.859066  22.539366  22.089707  0.204599   22.04025  
2016            598       592       21.892567  22.585867  22.282638  0.16751    22.247884 
2017            598       592       23.641966  24.326534  23.979663  0.161612   23.9459   
2018            598       592       22.3536    22.8517    22.63183   0.109755   22.597067 
2019            598       592       21.376766  21.7547    21.550204  0.120173   21.491384 
2020            598       592       24.342066  24.952299  24.646291  0.134578   24.6549   
2021            598       592       22.173599  22.7833    22.427472  0.106557   22.426534 
2022            598       592       22.0065    22.384132  22.150941  0.111245   22.12775  
2023            598       592       22.932827  23.616861  23.318189  0.183944   23.301534