Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            553       489       19.999334  20.2152    20.089027  0.048851   20.0734   
2008            553       489       20.790699  21.142267  20.942499  0.09608    20.909334 
2009            553       489       20.350367  20.789833  20.621997  0.088541   20.648233 
2010            553       489       20.690901  20.992567  20.796925  0.06409    20.785534 
2011            553       489       22.525656  22.978172  22.7476    0.087639   22.744896 
2012            553       489       22.879601  23.202932  23.037787  0.058942   23.0424   
2013            553       489       20.4715    20.715366  20.566468  0.042768   20.567066 
2014            553       489       20.106167  20.340733  20.211248  0.058565   20.204634 
2015            553       489       22.5014    22.834066  22.587506  0.076075   22.5525   
2016            553       489       21.114334  21.668066  21.364042  0.140989   21.3267   
2017            553       489       22.391201  23.000032  22.546754  0.156894   22.463133 
2018            553       489       20.753433  21.078733  20.904639  0.070038   20.896267 
2019            553       489       20.9804    21.2003    21.054226  0.062887   21.040501 
2020            553       489       22.332767  22.675566  22.478749  0.068964   22.4757   
2021            553       489       20.601101  20.826067  20.697584  0.051908   20.687401 
2022            553       489       21.480366  21.746468  21.60011   0.06592    21.590733 
2023            553       489       22.149103  22.378275  22.26941   0.061538   22.265207