Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            469       445       19.077257  20.007162  19.635686  0.224829   19.660936 
2008            469       445       19.96184   20.824194  20.489846  0.213527   20.51342  
2009            469       445       18.732355  19.538387  19.199602  0.19851    19.228128 
2010            469       445       18.671549  19.311743  19.03676   0.152339   19.058355 
2011            469       445       18.426161  19.787388  19.279953  0.330333   19.308161 
2012            469       445       19.279451  20.100677  19.789083  0.191233   19.800806 
2013            469       445       18.264709  19.674644  19.12462   0.34034    19.135065 
2014            469       445       17.914452  18.551096  18.29653   0.148685   18.323387 
2015            469       445       18.965967  19.484129  19.255177  0.121644   19.259451 
2016            469       445       19.673967  20.496645  20.135178  0.200646   20.134935 
2017            469       445       18.226742  19.372419  18.906459  0.274033   18.933935 
2018            469       445       16.555     17.835806  17.270186  0.325377   17.273161 
2019            469       445       16.918129  17.974483  17.529406  0.256802   17.553387 
2020            469       445       17.995935  18.911581  18.539283  0.221353   18.559193 
2021            469       445       20.356031  20.784258  20.517831  0.096213   20.492613 
2022            469       445       16.933098  17.839581  17.422931  0.234533   17.426291 
2023            469       445       18.170267  18.886     18.458404  0.18922    18.449167