Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            337       298       17.653484  17.921419  17.823936  0.050659   17.831226 
2008            337       298       17.09358   17.525257  17.269512  0.086066   17.261355 
2009            337       298       18.341806  18.765129  18.631626  0.111196   18.68029  
2010            337       298       15.825839  16.229515  16.030932  0.075375   16.029565 
2011            337       298       18.336807  18.607193  18.488968  0.042111   18.491709 
2012            337       298       19.633451  19.838839  19.783548  0.038267   19.789338 
2013            337       298       16.333872  17.085581  16.604227  0.129846   16.583306 
2014            337       298       16.117775  16.563     16.338445  0.082501   16.336806 
2015            337       298       17.968742  18.709194  18.382693  0.188095   18.385565 
2016            337       298       17.915356  18.375225  18.159159  0.103015   18.172532 
2017            337       298       18.794226  19.272226  19.004439  0.097235   18.999452 
2018            337       298       18.869129  19.40642   19.144283  0.11161    19.139032 
2019            337       298       17.21242   17.685064  17.459812  0.092319   17.457952 
2020            337       298       20.429096  20.676935  20.567263  0.0663     20.565614 
2021            337       298       17.904291  18.304935  18.130186  0.076929   18.130613 
2022            337       298       18.013742  18.470676  18.29164   0.080995   18.290613 
2023            337       298       20.346451  20.634678  20.514709  0.067749   20.531775