Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            612       576       16.25771   17.522581  17.311898  0.216255   17.392306 
2008            612       576       14.867678  16.17758   15.911052  0.254011   16.012177 
2009            612       576       14.162226  15.023065  14.771293  0.161499   14.813274 
2010            612       576       15.106774  16.307516  16.006823  0.284136   16.101919 
2011            612       576       16.194033  17.209969  17.021961  0.193235   17.106661 
2012            612       576       15.261419  16.841259  16.523326  0.326664   16.642871 
2013            612       576       15.975742  16.753872  16.610021  0.132426   16.653112 
2014            612       576       15.86229   17.280291  16.94742   0.294743   17.030258 
2015            612       576       15.088194  16.424582  15.925394  0.318695   15.98     
2016            612       576       15.87871   17.058128  16.619077  0.278072   16.670646 
2017            612       576       16.791193  17.791967  17.651644  0.162285   17.707758 
2018            612       576       16.104452  17.219257  16.883431  0.273411   16.947081 
2019            612       576       15.267612  16.496387  16.117575  0.267041   16.172016 
2020            612       576       16.019129  17.116386  16.873926  0.187551   16.91637  
2021            612       576       17.301935  18.483162  18.245988  0.214083   18.326726 
2022            612       576       15.895097  16.883259  16.564167  0.219415   16.593129 
2023            612       576       16.493     17.121807  16.971247  0.099659   16.976097