Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1060      930       21.456833  22.289467  21.840968  0.145449   21.836733 
2008            1060      930       20.628733  21.6003    21.034393  0.176234   21.022733 
2009            1060      930       20.256567  21.288967  20.83298   0.198631   20.875517 
2010            1060      930       21.111334  22.046     21.503589  0.159761   21.504666 
2011            1060      930       20.654867  21.682699  21.162829  0.198525   21.200767 
2012            1060      930       20.784067  22.122     21.342883  0.256046   21.318749 
2013            1060      930       21.260967  22.384701  21.743025  0.194998   21.73345  
2014            1060      930       19.714001  21.1448    20.333911  0.253957   20.310633 
2015            1060      930       21.474434  22.4345    21.896498  0.164401   21.887033 
2016            1060      930       22.316267  23.332167  22.793208  0.196211   22.8167   
2017            1060      930       21.8599    22.865101  22.315585  0.188805   22.303167 
2018            1060      930       19.869534  21.386333  20.487209  0.241867   20.474633 
2019            1060      930       18.262667  20.007401  19.114112  0.350807   19.200984 
2020            1060      930       21.906366  22.299601  22.098498  0.074434   22.083117 
2021            1060      930       20.781767  21.822067  21.285438  0.213568   21.306534 
2022            1060      930       21.334862  22.291103  21.800981  0.189273   21.807604 
2023            1060      930       19.5896    21.0222    20.300832  0.312981   20.323733