Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            559       485       16.803362  18.290361  17.49458   0.361151   17.46183  
2008            559       485       16.230604  17.419861  16.787248  0.279685   16.762047 
2009            559       485       16.077353  17.104134  16.536634  0.245209   16.502686 
2010            559       485       15.811663  16.74777   16.177574  0.227056   16.123631 
2011            559       485       16.238747  17.152458  16.589486  0.229298   16.532042 
2012            559       485       17.149519  17.999844  17.524416  0.210196   17.494041 
2013            559       485       15.935479  16.885998  16.334761  0.2444     16.295258 
2014            559       485       15.879655  16.823538  16.349222  0.227462   16.341909 
2015            559       485       16.02301   17.053568  16.46314   0.257661   16.421627 
2016            559       485       16.845274  17.471468  17.157509  0.15236    17.161882 
2017            559       485       16.759108  17.52565   17.059233  0.196862   17.00952  
2018            559       485       16.375196  17.082565  16.666213  0.166887   16.636576 
2019            559       485       16.880495  17.345417  17.084983  0.109325   17.078238 
2020            559       485       17.066486  17.675907  17.337881  0.133021   17.325974 
2021            559       485       16.773373  17.115477  16.933656  0.066217   16.939581 
2022            559       485       16.573629  17.077131  16.80762   0.103664   16.803984 
2023            559       485       16.98065   17.209146  17.125493  0.044501   17.127251