Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            595       550       27.666967  28.377968  28.112771  0.190854   28.140984 
2008            595       550       26.527678  27.533096  27.095988  0.278605   27.183161 
2009            595       550       26.647549  28.162161  27.598342  0.410686   27.734161 
2010            595       550       27.882517  28.486742  28.109248  0.129435   28.090226 
2011            595       550       28.026968  28.387194  28.237448  0.09113    28.253903 
2012            595       550       27.439968  27.808483  27.651582  0.083736   27.659726 
2013            595       550       26.136839  26.896355  26.650117  0.145163   26.674936 
2014            595       550       26.893839  27.275387  27.106394  0.098326   27.124887 
2015            595       550       27.06658   27.649065  27.389019  0.176623   27.411516 
2016            595       550       28.313387  29.167387  28.802919  0.183877   28.829645 
2017            595       550       27.069225  27.48245   27.25718   0.10173    27.234694 
2018            595       550       27.190483  28.068903  27.707377  0.205396   27.751371 
2019            595       550       27.498741  28.027807  27.78144   0.132913   27.787662 
2020            595       550       27.65571   28.24229   28.023929  0.136802   28.044855 
2021            595       550       28.037323  28.79187   28.48976   0.158909   28.520806 
2022            595       550       27.560516  28.226162  27.902941  0.125056   27.915113 
2023            595       550       27.995838  28.571711  28.27847   0.155394   28.273113