Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            309       273       15.622516  16.417257  16.102999  0.175378   16.117096 
2008            309       273       15.599258  16.330709  16.070641  0.144485   16.083839 
2009            309       273       16.688677  17.876064  17.440876  0.216689   17.44171  
2010            309       273       15.813613  16.759743  16.430843  0.1879     16.453323 
2011            309       273       15.782161  16.581129  16.371214  0.16426    16.40358  
2012            309       273       17.15287   18.560289  18.045809  0.299094   18.06287  
2013            309       273       15.404549  16.30229   16.043642  0.196262   16.083193 
2014            309       273       16.010517  16.97542   16.613896  0.201501   16.615225 
2015            309       273       16.239645  17.433548  17.094319  0.240723   17.137548 
2016            309       273       16.188065  17.459354  17.086119  0.256649   17.126194 
2017            309       273       14.889355  16.17971   15.817746  0.28998    15.883645 
2018            309       273       17.125484  18.23558   17.853777  0.227338   17.873032 
2019            309       273       15.976742  17.014065  16.604496  0.200597   16.629194 
2020            309       273       16.195999  18.117903  17.494543  0.378969   17.526161 
2021            309       273       17.64971   18.449291  18.078292  0.198092   18.095741 
2022            309       273       16.789129  18.110001  17.676223  0.259217   17.689968 
2023            309       273       17.315001  17.880226  17.638137  0.145141   17.679451