Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            5431      5188      18.743322  22.07177   20.670207  0.661253   20.708806 
2008            5431      5188      17.850248  20.809191  19.59749   0.629648   19.648005 
2009            5431      5188      17.530079  21.017925  19.640802  0.745082   19.729802 
2010            5431      5188      17.170538  20.332047  19.049074  0.656226   19.131742 
2011            5431      5188      17.552935  21.068464  19.577083  0.758545   19.626594 
2012            5431      5188      18.288589  21.782682  20.297339  0.744796   20.372001 
2013            5431      5188      17.221573  21.00741   19.344699  0.792818   19.40286  
2014            5431      5188      17.194555  21.548853  19.62097   0.904581   19.664808 
2015            5431      5188      17.521564  22.140852  20.239807  0.955174   20.305232 
2016            5431      5188      17.779612  21.843536  19.956734  0.805585   19.978349 
2017            5431      5188      17.882872  21.798838  19.925026  0.75998    19.939667 
2018            5431      5188      17.446859  21.522167  19.616573  0.847607   19.646904 
2019            5431      5188      17.617094  21.4088    19.740562  0.742489   19.805733 
2020            5431      5188      17.969929  21.469484  19.791261  0.707086   19.772644 
2021            5431      5188      17.385452  20.511316  19.17369   0.656632   19.174239 
2022            5431      5188      17.375528  21.433414  19.752693  0.858765   19.801227 
2023            5431      5188      17.359653  20.855024  19.246751  0.733554   19.267843