Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            104       66        20.974688  21.263803  21.159737  0.071276   21.173621 
2008            104       66        20.396017  20.686544  20.581703  0.075451   20.600844 
2009            104       66        20.61088   20.902647  20.800227  0.074774   20.816848 
2010            104       66        20.163849  20.455345  20.350459  0.073624   20.367692 
2011            104       66        20.807745  21.113918  21.002948  0.077016   21.018901 
2012            104       66        21.158459  21.453863  21.343966  0.070903   21.358132 
2013            104       66        20.307947  20.722021  20.567643  0.099439   20.583862 
2014            104       66        19.88785   20.305099  20.156053  0.106472   20.181278 
2015            104       66        20.520075  20.930998  20.780356  0.1004     20.796921 
2016            104       66        21.115847  21.523008  21.364763  0.101088   21.379159 
2017            104       66        21.270487  21.648706  21.501205  0.093284   21.5123   
2018            104       66        20.660007  21.050978  20.902284  0.098865   20.922106 
2019            104       66        21.276087  21.628731  21.493396  0.086951   21.509166 
2020            104       66        21.193375  21.575396  21.433851  0.093877   21.446785 
2021            104       66        20.700888  20.998814  20.88611   0.075254   20.897956 
2022            104       66        21.033466  21.391706  21.256768  0.088377   21.268609 
2023            104       66        20.8034    21.226128  21.065366  0.106546   21.081822