Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            560       525       17.767     18.791065  18.328806  0.26756    18.299807 
2008            560       525       17.486162  18.551678  18.050306  0.285353   18.076258 
2009            560       525       18.397194  19.627129  19.057322  0.321781   19.004097 
2010            560       525       14.865387  15.773709  15.3416    0.245696   15.345742 
2011            560       525       16.960903  18.215     17.655447  0.322457   17.611193 
2012            560       525       17.069967  17.894226  17.53016   0.206286   17.573322 
2013            560       525       17.700483  18.782936  18.280204  0.293607   18.320065 
2014            560       525       16.713097  17.616968  17.23568   0.23064    17.318548 
2015            560       525       17.749516  18.565838  18.19707   0.216733   18.235548 
2016            560       525       15.203     16.572128  15.914137  0.363313   15.965387 
2017            560       525       17.426161  18.355839  17.967446  0.240173   18.055742 
2018            560       525       14.869064  16.134613  15.566555  0.325633   15.673516 
2019            560       525       14.805323  15.988613  15.432409  0.320864   15.463775 
2020            560       525       16.317968  17.306194  16.836693  0.270801   16.85071  
2021            560       525       14.246742  15.867     15.100001  0.417163   15.187064 
2022            560       525       16.775677  18.25713   17.497305  0.415177   17.468807 
2023            560       525       15.066871  16.207064  15.76901   0.315834   15.846517