Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            553       489       28.928734  29.2075    29.060697  0.055717   29.062033 
2008            553       489       27.8445    28.150234  27.991329  0.078957   27.984734 
2009            553       489       28.227667  28.456301  28.354037  0.056976   28.356066 
2010            553       489       29.02      29.222733  29.142633  0.046716   29.150034 
2011            553       489       28.1707    28.381332  28.251854  0.044412   28.245234 
2012            553       489       28.0313    28.272333  28.151672  0.062256   28.160601 
2013            553       489       28.712366  29.115433  28.882268  0.076868   28.889467 
2014            553       489       28.895767  29.248966  29.057955  0.088504   29.031467 
2015            553       489       28.055134  28.462299  28.279818  0.084368   28.284901 
2016            553       489       29.058033  29.247101  29.144651  0.042135   29.1443   
2017            553       489       27.848801  28.2355    28.051119  0.119755   28.053366 
2018            553       489       29.630833  29.948967  29.749322  0.059022   29.740334 
2019            553       489       29.308599  29.483366  29.409597  0.037485   29.403233 
2020            553       489       28.089733  28.347134  28.222365  0.063971   28.2202   
2021            553       489       27.5819    27.927999  27.758316  0.069799   27.757366 
2022            553       489       28.754601  29.055866  28.887236  0.071748   28.881367 
2023            553       489       28.803699  29.137434  28.97684   0.06971    28.972567