Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            526       485       17.102161  18.318323  17.719033  0.25854    17.702549 
2008            526       485       16.963646  18.174871  17.656543  0.242186   17.673935 
2009            526       485       17.66687   19.002613  18.351635  0.279189   18.335968 
2010            526       485       14.328838  15.418258  14.981021  0.217411   14.99671  
2011            526       485       16.115355  17.601936  16.848719  0.323804   16.821451 
2012            526       485       16.789612  17.70513   17.383425  0.193336   17.428064 
2013            526       485       17.206419  18.379839  17.881097  0.231111   17.903742 
2014            526       485       16.366838  17.488581  17.0713    0.231189   17.114161 
2015            526       485       17.345549  18.35113   17.969253  0.207374   18.006548 
2016            526       485       14.717936  16.128     15.518368  0.288573   15.561161 
2017            526       485       17.425581  18.313999  18.035893  0.205821   18.101257 
2018            526       485       14.595968  16.000517  15.557902  0.324974   15.656129 
2019            526       485       14.236807  15.541742  14.937243  0.262227   14.959226 
2020            526       485       16.00013   16.965258  16.585454  0.215697   16.649935 
2021            526       485       14.149516  15.529936  15.057998  0.327013   15.159225 
2022            526       485       16.191162  17.571774  17.049696  0.287168   17.125065 
2023            526       485       14.901452  16.122227  15.760308  0.287049   15.857323