Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            310       302       21.705833  22.056101  21.89349   0.10258    21.922983 
2008            310       302       22.201534  22.648466  22.421349  0.145857   22.4136   
2009            310       302       21.634966  21.862066  21.717915  0.056038   21.716717 
2010            310       302       21.283733  21.5532    21.40057   0.041006   21.401383 
2011            310       302       22.987518  23.257206  23.139462  0.05937    23.137448 
2012            310       302       24.054134  24.295033  24.213911  0.048413   24.221983 
2013            310       302       20.294867  20.555433  20.430154  0.063824   20.431067 
2014            310       302       19.900366  20.3529    20.122847  0.115103   20.08365  
2015            310       302       21.884567  22.105667  21.979266  0.067375   21.951966 
2016            310       302       21.9632    22.339733  22.130739  0.104228   22.10975  
2017            310       302       23.406633  23.5798    23.487384  0.063466   23.455167 
2018            310       302       22.032667  22.407999  22.22664   0.111257   22.195316 
2019            310       302       21.567333  21.738966  21.650637  0.047332   21.632333 
2020            310       302       23.477533  24.1378    23.833201  0.190571   23.834599 
2021            310       302       21.837     22.813499  22.450735  0.244467   22.51895  
2022            310       302       22.013933  22.285233  22.151229  0.084488   22.162367 
2023            310       302       22.818518  23.50507   23.252479  0.155372   23.280845