Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            131       110       18.725323  18.950516  18.832082  0.054311   18.829985 
2008            131       110       19.528194  19.655388  19.593702  0.032342   19.596258 
2009            131       110       19.999645  20.223     20.110269  0.053109   20.107871 
2010            131       110       18.589001  18.841097  18.722034  0.06158    18.723129 
2011            131       110       19.275259  19.614677  19.45059   0.090844   19.454307 
2012            131       110       20.150387  20.318516  20.225124  0.041984   20.221855 
2013            131       110       19.145098  19.448709  19.308847  0.07045    19.312225 
2014            131       110       18.727613  18.915678  18.822135  0.04849    18.819758 
2015            131       110       20.332355  20.61429   20.46991   0.067755   20.466726 
2016            131       110       20.178549  20.418419  20.298987  0.063481   20.297452 
2017            131       110       18.700903  18.891613  18.792142  0.050972   18.792839 
2018            131       110       20.957903  21.206968  21.078944  0.064766   21.077855 
2019            131       110       19.783291  20.04842   19.917268  0.068367   19.917516 
2020            131       110       20.277515  20.64242   20.467924  0.089395   20.466743 
2021            131       110       21.442354  21.800161  21.614088  0.088051   21.607081 
2022            131       110       20.175709  20.525129  20.360665  0.087343   20.362209 
2023            131       110       19.114065  19.472258  19.287599  0.085739   19.277694