Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       20.658323  21.074322  20.738976  0.097117   20.694323 
2008            435       435       21.833677  22.530743  22.078614  0.176466   21.994322 
2009            435       435       19.741161  21.072742  20.636758  0.321062   20.696386 
2010            435       435       22.353291  23.483774  22.90309   0.245447   22.872644 
2011            435       435       21.540548  22.639709  22.010007  0.284796   21.960646 
2012            435       435       22.997257  23.49642   23.372758  0.099193   23.403839 
2013            435       435       22.774872  23.433516  23.279002  0.113729   23.304678 
2014            435       435       20.759516  21.322388  21.104175  0.10771    21.156485 
2015            435       435       21.628128  22.510677  22.296784  0.201649   22.346968 
2016            435       435       21.925194  23.01442   22.552446  0.225634   22.53529  
2017            435       435       21.778872  22.557936  22.367424  0.148282   22.401258 
2018            435       435       21.921516  22.969517  22.431155  0.297321   22.414387 
2019            435       435       22.174194  23.676548  22.802497  0.328547   22.737516 
2020            435       435       22.77371   24.36458   23.704727  0.359923   23.729677 
2021            435       435       21.362484  22.68758   21.854684  0.320526   21.761871 
2022            435       435       22.34371   22.903999  22.755863  0.128876   22.80513  
2023            435       435       23.353645  24.118872  23.91768   0.158157   23.959097