Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            733       712       28.460567  28.759701  28.635017  0.065362   28.629184 
2008            733       712       26.6201    27.1206    26.877973  0.098263   26.8689   
2009            733       712       27.907     28.254433  28.107547  0.088915   28.110451 
2010            733       712       28.8244    29.088301  28.996889  0.050094   29.008083 
2011            733       712       27.428066  28.115034  27.761449  0.163206   27.7757   
2012            733       712       27.711834  27.984266  27.824782  0.072172   27.800283 
2013            733       712       28.929832  29.239     29.080282  0.059598   29.07815  
2014            733       712       28.769466  28.909866  28.849054  0.03133    28.852933 
2015            733       712       27.793533  27.981367  27.892365  0.043014   27.888801 
2016            733       712       29.427467  29.647034  29.541091  0.051801   29.542967 
2017            733       712       27.270901  27.666367  27.430566  0.101585   27.413183 
2018            733       712       29.385267  29.620266  29.49368   0.052891   29.49505  
2019            733       712       29.547033  29.892433  29.752285  0.071862   29.760267 
2020            733       712       27.714466  28.166567  27.898758  0.09809    27.8803   
2021            733       712       27.4025    28.010033  27.739025  0.144424   27.750501 
2022            733       712       28.4886    28.980133  28.746419  0.124891   28.76325  
2023            733       712       29.138533  29.641134  29.393359  0.103558   29.383683