Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            158       154       19.933367  20.205799  20.123724  0.076796   20.154866 
2008            158       154       20.834433  20.983366  20.900935  0.044017   20.901417 
2009            158       154       20.551134  20.723234  20.651569  0.045288   20.658784 
2010            158       154       20.666     20.800167  20.731166  0.033941   20.728283 
2011            158       154       22.66931   22.88431   22.787001  0.059337   22.789121 
2012            158       154       22.925766  23.156166  23.082833  0.054589   23.098049 
2013            158       154       20.355967  20.521933  20.456156  0.046821   20.464816 
2014            158       154       20.231068  20.285833  20.263215  0.015671   20.26595  
2015            158       154       22.352734  22.493366  22.428496  0.034093   22.42755  
2016            158       154       21.1651    21.345499  21.277272  0.056584   21.299783 
2017            158       154       22.261101  22.365999  22.321608  0.026005   22.3256   
2018            158       154       20.755934  20.9156    20.839316  0.045594   20.8428   
2019            158       154       20.897867  21.017     20.969957  0.032852   20.978333 
2020            158       154       22.259333  22.468401  22.387688  0.057135   22.401033 
2021            158       154       20.6091    20.725166  20.669343  0.028652   20.678467 
2022            158       154       21.3895    21.5296    21.491195  0.033259   21.5038   
2023            158       154       22.193172  22.351793  22.304403  0.039736   22.319534