Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            890       875       15.649214  17.027893  16.405436  0.295665   16.416857 
2008            890       875       17.448793  18.403414  17.984352  0.25337    18.010311 
2009            890       875       16.352285  17.481035  16.991382  0.226765   17.015142 
2010            890       875       13.207679  14.553928  13.906093  0.284428   13.895785 
2011            890       875       15.333928  16.510107  15.917044  0.270526   15.875072 
2012            890       875       17.843035  18.695208  18.298157  0.189444   18.282759 
2013            890       875       17.063393  17.977142  17.615951  0.203552   17.646463 
2014            890       875       15.492642  16.614357  16.142995  0.240507   16.154964 
2015            890       875       15.421679  16.988535  16.228613  0.348727   16.219107 
2016            890       875       15.490655  16.609827  16.038121  0.270045   16.048725 
2017            890       875       18.501249  19.233     18.905686  0.1565     18.919107 
2018            890       875       18.544571  19.840143  19.279217  0.267506   19.269178 
2019            890       875       16.535429  17.813965  17.24177   0.287839   17.288214 
2020            890       875       15.516655  16.671587  16.109024  0.260895   16.124552 
2021            890       875       15.505769  17.137691  16.408798  0.371992   16.427769 
2022            890       875       14.301036  16.566036  15.493882  0.496498   15.481571 
2023            890       875       17.877893  18.802357  18.360879  0.227828   18.378963