Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1281      519       19.351387  19.815935  19.571097  0.110288   19.537226 
2008            1281      519       18.168903  18.662613  18.315068  0.082709   18.292999 
2009            1281      519       19.730904  19.98942   19.897755  0.066065   19.918386 
2010            1281      519       16.060322  16.628839  16.355596  0.141049   16.349356 
2011            1281      519       20.353323  20.604452  20.536196  0.045716   20.542065 
2012            1281      519       21.260323  21.684032  21.457972  0.100456   21.433323 
2013            1281      519       17.153677  18.013161  17.480831  0.182353   17.464258 
2014            1281      519       16.897291  17.724903  17.225993  0.197214   17.179323 
2015            1281      519       19.034033  20.043097  19.432603  0.180893   19.44129  
2016            1281      519       18.964678  19.365549  19.152881  0.079808   19.139774 
2017            1281      519       19.876581  20.675838  20.167515  0.15431    20.166935 
2018            1281      519       19.208225  20.30187   19.61827   0.18178    19.585741 
2019            1281      519       16.922871  18.157644  17.363565  0.253157   17.327871 
2020            1281      519       20.671484  21.032516  20.916606  0.077416   20.929291 
2021            1281      519       18.78813   19.748354  19.050034  0.135818   19.021    
2022            1281      519       18.248064  19.344355  18.637728  0.21796    18.612936 
2023            1281      519       20.959806  21.639549  21.334828  0.100981   21.356678