Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            81        57        19.808033  19.948774  19.907887  0.038185   19.916677 
2008            81        57        17.250517  17.318033  17.283224  0.019965   17.287451 
2009            81        57        16.743162  16.904968  16.826245  0.04044    16.82313  
2010            81        57        17.668064  17.868677  17.758355  0.05044    17.751806 
2011            81        57        17.631903  17.689936  17.665984  0.013174   17.667839 
2012            81        57        18.044903  18.144709  18.090727  0.023397   18.089451 
2013            81        57        18.00271   18.077097  18.057612  0.019908   18.064774 
2014            81        57        18.290291  18.422516  18.352031  0.032097   18.349386 
2015            81        57        17.13884   17.261614  17.178761  0.033294   17.168064 
2016            81        57        18.39187   18.5       18.435354  0.029629   18.434999 
2017            81        57        19.62858   19.689709  19.665882  0.014007   19.667742 
2018            81        57        19.65287   19.717064  19.682052  0.015498   19.678162 
2019            81        57        18.345774  18.411291  18.379333  0.016232   18.379644 
2020            81        57        18.23984   18.549904  18.374748  0.078197   18.362387 
2021            81        57        19.249193  19.471001  19.357853  0.052322   19.349806 
2022            81        57        16.792257  16.987741  16.878478  0.05053    16.871677 
2023            81        57        17.551001  17.806129  17.665099  0.06479    17.654839