Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            81        35        21.552088  21.790846  21.689233  0.061734   21.689178 
2008            81        35        20.915655  21.195845  21.073943  0.071174   21.077291 
2009            81        35        20.71944   21.021921  20.89565   0.076203   20.900826 
2010            81        35        20.590322  20.929159  20.787264  0.085466   20.793684 
2011            81        35        21.114824  21.390203  21.274464  0.068469   21.280466 
2012            81        35        21.336653  21.591604  21.486474  0.063701   21.492588 
2013            81        35        20.54269   20.905575  20.758809  0.090985   20.767778 
2014            81        35        20.529938  20.984379  20.79172   0.114105   20.799547 
2015            81        35        21.101257  21.494537  21.326875  0.100074   21.329849 
2016            81        35        20.871241  21.27495   21.11135   0.100725   21.1215   
2017            81        35        21.014338  21.403231  21.240057  0.096741   21.245443 
2018            81        35        21.115986  21.444838  21.306798  0.082337   21.313465 
2019            81        35        21.407625  21.654831  21.548867  0.062448   21.554111 
2020            81        35        21.136959  21.407667  21.294951  0.068104   21.300814 
2021            81        35        20.265129  20.526697  20.419658  0.064615   20.426777 
2022            81        35        20.433599  20.801109  20.646035  0.090759   20.649076 
2023            81        35        20.749931  21.070345  20.933238  0.080575   20.936972