Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            81        57        19.596966  19.8587    19.727442  0.067011   19.730301 
2008            81        57        19.314934  19.467768  19.398502  0.041145   19.398134 
2009            81        57        18.333033  18.872833  18.648305  0.142981   18.670534 
2010            81        57        19.895599  20.192966  20.035341  0.074378   20.037466 
2011            81        57        20.746033  20.929533  20.853099  0.048164   20.856133 
2012            81        57        20.6971    21.030899  20.895938  0.089505   20.913401 
2013            81        57        18.7467    19.003399  18.869625  0.065358   18.871099 
2014            81        57        19.932133  20.128633  20.048805  0.050803   20.053366 
2015            81        57        19.939133  20.212999  20.07338   0.069337   20.075634 
2016            81        57        19.111467  19.328667  19.241102  0.055682   19.2437   
2017            81        57        18.7111    18.9874    18.854456  0.069431   18.858667 
2018            81        57        19.279333  19.527666  19.403519  0.063963   19.406467 
2019            81        57        19.872534  20.124733  20.006532  0.064335   20.0165   
2020            81        57        19.174566  19.554068  19.337317  0.091679   19.3344   
2021            81        57        19.379467  19.791666  19.581374  0.100752   19.587868 
2022            81        57        19.772999  19.951033  19.87491   0.047145   19.883766 
2023            81        57        19.025333  19.590866  19.304163  0.138979   19.310499