Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            275       142       20.921829  21.472158  21.232778  0.13709    21.255045 
2008            275       142       20.33666   20.896847  20.664133  0.143394   20.68928  
2009            275       142       20.279621  20.867838  20.646762  0.156779   20.67732  
2010            275       142       20.046375  20.645351  20.40078   0.158311   20.426047 
2011            275       142       20.658525  21.213308  21.005947  0.147922   21.03349  
2012            275       142       20.979185  21.53014   21.330721  0.143029   21.365822 
2013            275       142       19.971975  20.744732  20.452248  0.209208   20.495311 
2014            275       142       19.860756  20.678331  20.345522  0.210054   20.380813 
2015            275       142       20.425112  21.142277  20.862696  0.188008   20.900379 
2016            275       142       20.62476   21.35507   21.094272  0.189882   21.146477 
2017            275       142       20.888763  21.557732  21.330703  0.17368    21.381745 
2018            275       142       20.620724  21.225897  21.009149  0.165105   21.049963 
2019            275       142       20.995491  21.580353  21.367526  0.152267   21.407194 
2020            275       142       20.801777  21.464672  21.23492   0.172022   21.285229 
2021            275       142       20.273748  20.873272  20.683869  0.157544   20.733734 
2022            275       142       20.467701  21.223269  20.964463  0.196615   21.023376 
2023            275       142       20.358717  21.107677  20.848846  0.200006   20.905063