Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            890       875       16.606936  17.845322  17.388612  0.283417   17.434774 
2008            890       875       16.394258  18.031485  17.260509  0.35888    17.268129 
2009            890       875       16.701355  17.92713   17.34952   0.278528   17.372194 
2010            890       875       14.83629   15.927581  15.390451  0.22556    15.37129  
2011            890       875       14.210968  15.60829   14.895691  0.290114   14.875355 
2012            890       875       17.032097  18.090775  17.593857  0.234166   17.609549 
2013            890       875       17.808678  18.825226  18.354135  0.2164     18.353743 
2014            890       875       14.106968  15.800033  15.016256  0.355583   15.017355 
2015            890       875       16.007612  17.601162  16.85292   0.342519   16.837355 
2016            890       875       14.263452  16.124355  15.289076  0.429487   15.315193 
2017            890       875       17.881388  19.203096  18.680895  0.286737   18.701387 
2018            890       875       14.290646  16.608807  15.504709  0.494725   15.494064 
2019            890       875       15.497484  16.941065  16.302464  0.327201   16.320322 
2020            890       875       15.67      17.080645  16.396375  0.344255   16.440678 
2021            890       875       14.610065  16.584904  15.539663  0.43633    15.481613 
2022            890       875       15.931935  18.205065  17.115774  0.49079    17.102839 
2023            890       875       16.460613  18.222807  17.435448  0.427704   17.466806