Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       12.816967  13.282467  12.988847  0.118749   12.964467 
2008            435       435       12.217     12.651967  12.411021  0.144506   12.377033 
2009            435       435       12.783767  13.008266  12.912258  0.059805   12.923266 
2010            435       435       12.007401  12.227233  12.079022  0.05025    12.0649   
2011            435       435       12.704766  13.022266  12.836791  0.097988   12.838167 
2012            435       435       12.0397    12.730066  12.295885  0.214399   12.240033 
2013            435       435       12.668266  12.981566  12.735928  0.080129   12.707067 
2014            435       435       12.789866  13.103367  12.916244  0.077914   12.9039   
2015            435       435       13.936433  14.3249    14.105217  0.106374   14.097433 
2016            435       435       13.327233  13.926766  13.548545  0.178764   13.4935   
2017            435       435       13.938467  14.2367    14.05506   0.091409   14.029266 
2018            435       435       11.747033  12.326433  12.016726  0.173961   11.9465   
2019            435       435       13.0591    13.582434  13.258986  0.13373    13.224267 
2020            435       435       13.5783    13.974033  13.725565  0.10321    13.731566 
2021            435       435       14.3472    14.583034  14.477465  0.064779   14.495133 
2022            435       435       14.073034  14.399483  14.213239  0.087937   14.208793 
2023            435       435       13.237534  13.6758    13.441589  0.121063   13.424067