Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            469       445       19.129549  19.565968  19.456393  0.101984   19.484324 
2008            469       445       18.456291  19.052839  18.907733  0.15311    18.964903 
2009            469       445       18.927     19.330452  19.223889  0.082163   19.241259 
2010            469       445       16.461775  16.697258  16.632771  0.056351   16.656355 
2011            469       445       19.324291  19.61484   19.547269  0.066855   19.569033 
2012            469       445       19.769194  20.235388  20.106817  0.109422   20.143644 
2013            469       445       17.560774  18.091322  17.887692  0.133409   17.901419 
2014            469       445       16.270645  16.924999  16.701051  0.15495    16.707678 
2015            469       445       17.730709  18.304678  18.155469  0.131804   18.192226 
2016            469       445       19.302549  19.700871  19.592699  0.10399    19.62742  
2017            469       445       19.666033  20.304838  20.110736  0.167972   20.139774 
2018            469       445       19.907614  20.498323  20.300159  0.14469    20.316193 
2019            469       445       17.921129  18.655258  18.365308  0.177402   18.371548 
2020            469       445       20.186419  20.457161  20.378653  0.067973   20.402515 
2021            469       445       17.119709  18.593935  18.038021  0.297636   18.069452 
2022            469       445       15.69229   16.50013   16.203634  0.197209   16.222902 
2023            469       445       20.736227  22.011419  21.382228  0.271205   21.394064