Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            469       445       21.590099  21.754601  21.665306  0.030659   21.6639   
2008            469       445       21.969467  22.453867  22.316681  0.130651   22.356899 
2009            469       445       21.472067  21.802601  21.692333  0.080909   21.710899 
2010            469       445       21.4238    21.7768    21.697125  0.072109   21.725567 
2011            469       445       22.875172  23.33807   23.21822   0.125177   23.263655 
2012            469       445       24.1523    24.358034  24.28175   0.049065   24.286766 
2013            469       445       20.235834  20.622534  20.506194  0.090039   20.531067 
2014            469       445       20.007467  20.4088    20.296043  0.104816   20.335733 
2015            469       445       21.812067  22.156067  22.068365  0.08732    22.105301 
2016            469       445       22.241367  22.473999  22.401058  0.045457   22.4053   
2017            469       445       23.207901  23.4582    23.403923  0.060761   23.428133 
2018            469       445       21.869633  22.153833  22.062133  0.063019   22.059933 
2019            469       445       21.444067  21.749332  21.661889  0.075533   21.6803   
2020            469       445       23.383266  23.898567  23.608538  0.123883   23.598867 
2021            469       445       21.478901  22.785034  22.1846    0.287414   22.198999 
2022            469       445       22.122034  22.3111    22.263593  0.043899   22.278366 
2023            469       445       22.619276  23.378277  22.99921   0.18853    23.003172