Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            274       250       15.257483  15.758806  15.473389  0.109753   15.469629 
2008            274       250       11.708612  12.143193  11.944804  0.097489   11.946468 
2009            274       250       12.248645  12.905903  12.617147  0.142875   12.626742 
2010            274       250       12.019194  12.528871  12.254366  0.117913   12.244016 
2011            274       250       13.297968  13.991871  13.647929  0.156891   13.634048 
2012            274       250       14.122516  14.648742  14.385341  0.115136   14.38042  
2013            274       250       12.488     13.105968  12.796384  0.143877   12.791935 
2014            274       250       13.741677  14.642097  14.257955  0.196511   14.265565 
2015            274       250       14.885161  15.650097  15.309598  0.16912    15.308194 
2016            274       250       13.713387  14.458258  14.138652  0.158634   14.148081 
2017            274       250       12.723323  13.507613  13.150062  0.173672   13.149726 
2018            274       250       13.212483  13.827419  13.552176  0.136043   13.550968 
2019            274       250       15.893871  16.545904  16.313666  0.130216   16.327662 
2020            274       250       14.41458   15.33629   14.897037  0.227229   14.925758 
2021            274       250       14.607645  15.742774  15.117071  0.250272   15.150049 
2022            274       250       14.318226  14.824033  14.514725  0.113903   14.498097 
2023            274       250       14.257807  15.043613  14.578738  0.168069   14.564919