Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            96        90        19.600775  20.085678  19.767603  0.104262   19.762114 
2008            96        90        18.773483  19.044645  18.864897  0.060102   18.856145 
2009            96        90        17.836258  18.007967  17.950829  0.043335   17.95871  
2010            96        90        16.749968  17.243225  16.909006  0.10834    16.894065 
2011            96        90        14.846935  15.106903  14.948302  0.048738   14.957645 
2012            96        90        18.41958   18.612     18.485263  0.045488   18.474532 
2013            96        90        19.44829   19.816257  19.634359  0.086156   19.662419 
2014            96        90        17.49958   18.051451  17.649887  0.123704   17.617951 
2015            96        90        18.332838  18.893517  18.527261  0.136651   18.490758 
2016            96        90        18.570227  19.131742  18.738384  0.127746   18.711243 
2017            96        90        19.188967  19.512386  19.276237  0.069664   19.256032 
2018            96        90        15.862032  16.282709  15.997248  0.085938   15.988145 
2019            96        90        17.766258  18.141258  17.875348  0.087259   17.851484 
2020            96        90        18.900904  19.265354  18.990881  0.074805   18.973742 
2021            96        90        17.383129  17.556936  17.457806  0.036143   17.460532 
2022            96        90        18.973259  19.34642   19.062769  0.071155   19.048403 
2023            96        90        18.343742  18.733774  18.463422  0.071567   18.455484