Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            612       576       20.203161  20.986225  20.762937  0.150457   20.779225 
2008            612       576       20.48571   21.427902  21.132863  0.196822   21.175354 
2009            612       576       21.61729   22.470516  22.255127  0.189189   22.317533 
2010            612       576       20.901258  21.78829   21.605859  0.157676   21.66121  
2011            612       576       21.137548  21.994032  21.813677  0.182871   21.877662 
2012            612       576       22.43458   23.326355  23.10663   0.178663   23.15808  
2013            612       576       20.540323  21.975388  21.570621  0.302183   21.652822 
2014            612       576       20.149065  20.896839  20.687809  0.142476   20.738452 
2015            612       576       21.91287   22.853838  22.5904    0.203526   22.633403 
2016            612       576       22.006128  22.861387  22.640887  0.172519   22.698403 
2017            612       576       20.14629   21.17371   20.915299  0.179115   20.970274 
2018            612       576       22.372936  23.510967  23.256424  0.192917   23.30929  
2019            612       576       21.676645  22.535549  22.285332  0.197286   22.342371 
2020            612       576       22.441904  23.27858   23.098909  0.160299   23.150533 
2021            612       576       22.122129  23.31671   22.954943  0.259997   23.004838 
2022            612       576       21.44171   22.558128  22.31651   0.221636   22.392661 
2023            612       576       20.443419  21.474161  21.235392  0.18334    21.289452