Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            74        54        21.781532  21.888435  21.83393   0.026768   21.834626 
2008            74        54        21.105768  21.236746  21.164778  0.032194   21.162604 
2009            74        54        20.922422  21.067249  20.991838  0.036068   20.994505 
2010            74        54        20.711454  20.888641  20.78691   0.043617   20.785313 
2011            74        54        21.171135  21.330008  21.242266  0.039038   21.242989 
2012            74        54        21.46629   21.589987  21.525664  0.031132   21.526536 
2013            74        54        20.707041  20.878994  20.789738  0.043336   20.792821 
2014            74        54        20.711926  20.925457  20.811975  0.052886   20.814861 
2015            74        54        21.327795  21.521006  21.417382  0.047775   21.420403 
2016            74        54        21.067181  21.257284  21.15657   0.04707    21.156096 
2017            74        54        21.114876  21.298357  21.20208   0.045866   21.200592 
2018            74        54        21.289148  21.468786  21.370247  0.043827   21.372869 
2019            74        54        21.51248   21.627901  21.568059  0.029504   21.56938  
2020            74        54        21.332085  21.466057  21.399308  0.035774   21.401329 
2021            74        54        20.226236  20.3787    20.293475  0.037578   20.292718 
2022            74        54        20.527777  20.722277  20.615292  0.047746   20.617876 
2023            74        54        20.828976  21.016275  20.92708   0.046309   20.930607