Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            710       666       16.998903  17.428871  17.278477  0.079767   17.272354 
2008            710       666       16.856451  17.734386  17.325991  0.142698   17.299854 
2009            710       666       18.221001  18.762516  18.565821  0.097625   18.558887 
2010            710       666       17.258259  18.126451  17.765444  0.169515   17.769307 
2011            710       666       17.453032  18.091227  17.83294   0.111967   17.834823 
2012            710       666       18.974483  19.714806  19.383074  0.144196   19.347855 
2013            710       666       16.873096  17.498838  17.21719   0.128292   17.19429  
2014            710       666       17.065258  17.532097  17.39097   0.080159   17.408419 
2015            710       666       17.736258  18.42271   18.121144  0.133006   18.093919 
2016            710       666       17.488419  18.059225  17.797656  0.112231   17.779242 
2017            710       666       16.203419  16.914614  16.534686  0.194433   16.481807 
2018            710       666       18.149     18.895226  18.591674  0.153017   18.574742 
2019            710       666       17.632904  18.379257  18.028154  0.123296   18.017984 
2020            710       666       18.451097  19.043711  18.745867  0.118732   18.720823 
2021            710       666       19.016838  19.384613  19.169833  0.095718   19.154645 
2022            710       666       18.543259  19.252548  18.994682  0.138261   19.015596 
2023            710       666       18.037291  18.569613  18.258802  0.149343   18.233984