Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            563       558       13.0784    13.3496    13.201742  0.072021   13.193684 
2008            563       558       13.192933  13.3352    13.281808  0.032003   13.287317 
2009            563       558       12.6136    12.92      12.771215  0.07642    12.766783 
2010            563       558       12.774533  12.9795    12.876617  0.0589     12.86905  
2011            563       558       12.637767  12.9889    12.761302  0.080957   12.74055  
2012            563       558       14.261467  14.693666  14.454885  0.108587   14.4493   
2013            563       558       12.8305    13.285633  13.03399   0.113649   13.039367 
2014            563       558       15.491067  15.7145    15.620286  0.054994   15.631567 
2015            563       558       14.285566  14.826366  14.543745  0.130153   14.543617 
2016            563       558       14.520801  14.930567  14.716495  0.104106   14.703267 
2017            563       558       14.1482    14.697567  14.35858   0.145061   14.332266 
2018            563       558       14.379633  15.106234  14.741407  0.19814    14.740133 
2019            563       558       13.638567  13.9144    13.754734  0.075718   13.73705  
2020            563       558       13.094367  13.324767  13.250488  0.048174   13.259384 
2021            563       558       14.094067  14.409866  14.266271  0.078326   14.2926   
2022            563       558       12.205414  12.723035  12.499123  0.135758   12.503672 
2023            563       558       14.3597    14.625367  14.487777  0.058568   14.489267