Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       20.393534  21.702734  21.259242  0.276727   21.265867 
2008            435       435       20.163467  21.146034  20.831171  0.228442   20.907267 
2009            435       435       19.950367  20.607     20.340841  0.124518   20.350901 
2010            435       435       20.698833  21.301399  21.072432  0.110799   21.077999 
2011            435       435       20.401733  20.954067  20.704667  0.131951   20.736599 
2012            435       435       21.320299  22.190666  21.98516   0.206519   22.0735   
2013            435       435       19.979834  20.950333  20.619445  0.195403   20.679367 
2014            435       435       21.189934  21.878233  21.566073  0.193083   21.4806   
2015            435       435       21.827534  22.756701  22.511492  0.224103   22.603634 
2016            435       435       22.208334  22.630301  22.458898  0.080216   22.4568   
2017            435       435       20.1506    21.0063    20.722115  0.187725   20.804066 
2018            435       435       21.972467  22.855534  22.447187  0.19741    22.4457   
2019            435       435       20.8256    21.497566  21.28327   0.128689   21.305901 
2020            435       435       21.159401  21.973633  21.796508  0.160386   21.869801 
2021            435       435       21.518734  22.462999  22.076611  0.212895   22.073833 
2022            435       435       21.927166  22.552967  22.303496  0.130532   22.298267 
2023            435       435       21.376167  21.842766  21.687838  0.090266   21.708134