Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            598       592       29.249067  29.6842    29.509748  0.122649   29.530267 
2008            598       592       27.767534  28.159166  28.070424  0.062713   28.084633 
2009            598       592       29.143066  29.507799  29.383024  0.071062   29.390933 
2010            598       592       28.996433  29.223133  29.125144  0.037056   29.120266 
2011            598       592       29.249533  29.395567  29.334735  0.037864   29.346366 
2012            598       592       28.000067  28.440001  28.188338  0.140772   28.180533 
2013            598       592       29.119633  29.244267  29.188228  0.030588   29.193916 
2014            598       592       28.631866  29.064568  28.962787  0.078167   28.983434 
2015            598       592       28.728233  29.154301  28.959997  0.096575   28.965366 
2016            598       592       29.990267  30.340233  30.164939  0.104337   30.196567 
2017            598       592       28.012766  28.396933  28.233949  0.096081   28.217916 
2018            598       592       28.805834  29.046101  28.948743  0.062912   28.963166 
2019            598       592       29.329334  29.688866  29.502581  0.099535   29.497816 
2020            598       592       28.558367  28.9182    28.751378  0.073753   28.758083 
2021            598       592       29.555567  29.860968  29.766649  0.052455   29.767099 
2022            598       592       29.429167  29.717466  29.609666  0.066668   29.610833 
2023            598       592       30.006634  30.5571    30.353759  0.125248   30.340117