Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            590       553       27.6196    28.666     28.406089  0.225723   28.4697   
2008            590       553       28.425467  29.010468  28.832212  0.122089   28.866066 
2009            590       553       28.755234  29.737333  29.467152  0.220796   29.531599 
2010            590       553       29.476799  30.097134  29.984205  0.113218   30.020399 
2011            590       553       28.9389    29.453066  29.260162  0.101108   29.261    
2012            590       553       28.215134  28.983299  28.729671  0.177435   28.780399 
2013            590       553       28.305332  29.173567  28.982081  0.203197   29.061533 
2014            590       553       28.355034  29.170933  28.818008  0.177702   28.824368 
2015            590       553       28.701166  29.351034  29.214873  0.129497   29.260666 
2016            590       553       28.877134  29.248766  29.161099  0.081498   29.183266 
2017            590       553       28.312233  28.911234  28.767993  0.143092   28.808067 
2018            590       553       28.822733  29.446833  29.312616  0.130817   29.352867 
2019            590       553       28.991632  29.747633  29.497117  0.135952   29.5205   
2020            590       553       29.008633  29.810167  29.452925  0.13645    29.470833 
2021            590       553       28.148001  28.9023    28.655536  0.164437   28.665733 
2022            590       553       28.839966  29.461933  29.276918  0.141945   29.320267 
2023            590       553       28.814333  30.304001  29.737223  0.361011   29.820133