Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            3568      3463      17.26016   19.920612  19.378888  0.545046   19.593807 
2008            3568      3463      16.416388  18.252806  17.60703   0.419741   17.686838 
2009            3568      3463      15.702161  17.140097  16.747728  0.268038   16.801838 
2010            3568      3463      16.223162  18.199646  17.73722   0.389429   17.856678 
2011            3568      3463      16.986258  18.904032  18.376576  0.453724   18.547226 
2012            3568      3463      16.66029   18.877064  18.310019  0.418335   18.440742 
2013            3568      3463      16.879807  18.697548  18.209175  0.401241   18.351807 
2014            3568      3463      17.704258  18.607098  18.247164  0.218431   18.283678 
2015            3568      3463      16.997257  18.461     17.963463  0.349433   18.001936 
2016            3568      3463      17.623161  19.249388  18.717579  0.320041   18.746807 
2017            3568      3463      17.984259  19.95829   19.459954  0.407863   19.581806 
2018            3568      3463      17.665903  19.233839  18.832344  0.307581   18.928354 
2019            3568      3463      16.944225  18.668581  18.191185  0.389789   18.313129 
2020            3568      3463      17.35442   18.607388  18.21848   0.286631   18.289549 
2021            3568      3463      18.547581  20.065613  19.678975  0.309566   19.768999 
2022            3568      3463      16.812742  18.230742  17.759531  0.303339   17.755451 
2023            3568      3463      16.984549  18.405226  17.960272  0.303614   18.036064