Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       12.727584  13.311852  13.003201  0.13547    12.997847 
2008            435       435       12.720904  13.383861  13.007645  0.16385    12.985533 
2009            435       435       12.289762  12.971532  12.608531  0.174746   12.576507 
2010            435       435       12.794811  13.319129  13.088775  0.100151   13.090657 
2011            435       435       12.765047  13.249822  13.031485  0.123375   13.045954 
2012            435       435       14.302057  14.836811  14.55339   0.125823   14.552257 
2013            435       435       12.855924  13.373748  13.160861  0.118939   13.177028 
2014            435       435       12.424458  12.817258  12.591626  0.085843   12.5794   
2015            435       435       12.614757  13.349797  12.937003  0.175683   12.911691 
2016            435       435       13.634536  14.343386  13.899312  0.162793   13.855519 
2017            435       435       13.193055  13.852937  13.512481  0.140533   13.497512 
2018            435       435       12.74086   13.348233  12.930461  0.164417   12.879479 
2019            435       435       13.011436  13.555896  13.198747  0.140663   13.146869 
2020            435       435       13.633386  14.19668   13.907968  0.127555   13.893563 
2021            435       435       13.584024  14.090854  13.830506  0.099007   13.825808 
2022            435       435       13.568794  13.823755  13.633824  0.062022   13.610785 
2023            435       435       13.659702  14.147846  13.923626  0.104533   13.912325