Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1080      952       19.095533  20.661734  19.918658  0.401339   19.9347   
2008            1080      952       19.216566  20.674099  19.988004  0.347141   20.006483 
2009            1080      952       18.629566  20.824734  19.837749  0.566422   19.882199 
2010            1080      952       19.651867  21.135433  20.477019  0.346863   20.5273   
2011            1080      952       18.531933  20.0993    19.437389  0.376729   19.4765   
2012            1080      952       18.564699  20.464834  19.591212  0.480806   19.62825  
2013            1080      952       19.568001  21.136467  20.494195  0.387132   20.542867 
2014            1080      952       18.975567  20.617666  19.909219  0.374679   19.985367 
2015            1080      952       20.729467  22.187334  21.519049  0.326797   21.502067 
2016            1080      952       20.480234  21.876667  21.174846  0.345171   21.150167 
2017            1080      952       19.058666  21.007732  19.913622  0.470645   19.822667 
2018            1080      952       19.774967  21.671967  20.865242  0.485951   20.91925  
2019            1080      952       18.373833  20.441933  19.497483  0.515206   19.517    
2020            1080      952       20.097733  21.658066  20.927027  0.405695   20.937334 
2021            1080      952       18.3566    20.527401  19.516853  0.549767   19.573033 
2022            1080      952       19.259829  20.598965  20.004976  0.306122   20.022465 
2023            1080      952       19.289734  20.676933  19.990571  0.358945   19.985583