Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            81        57        13.853617  13.901107  13.882603  0.009657   13.883041 
2008            81        57        13.437314  13.465916  13.451519  0.00705    13.451503 
2009            81        57        13.237858  13.268677  13.251739  0.007506   13.251786 
2010            81        57        13.631542  13.663321  13.649118  0.007884   13.649373 
2011            81        57        13.759879  13.790437  13.781059  0.006887   13.782132 
2012            81        57        15.080322  15.106874  15.099044  0.006245   15.099945 
2013            81        57        13.49032   13.518819  13.510305  0.007955   13.512857 
2014            81        57        13.206701  13.324334  13.266666  0.02725    13.263946 
2015            81        57        13.767091  13.828381  13.797823  0.013482   13.797206 
2016            81        57        14.520194  14.562689  14.540955  0.009109   14.540281 
2017            81        57        14.192581  14.251455  14.226382  0.013899   14.228041 
2018            81        57        13.708381  13.777381  13.74601   0.015765   13.745869 
2019            81        57        13.987372  14.038395  14.016449  0.011114   14.017104 
2020            81        57        14.503506  14.534494  14.516333  0.007323   14.516047 
2021            81        57        14.233529  14.270551  14.246404  0.010104   14.244044 
2022            81        57        13.803569  13.929099  13.863962  0.03076    13.860816 
2023            81        57        14.400248  14.437771  14.4182    0.009312   14.417356