Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            598       592       29.068871  29.629227  29.392505  0.136016   29.406936 
2008            598       592       28.315968  28.850807  28.571447  0.136562   28.536806 
2009            598       592       28.361193  29.065453  28.778659  0.147908   28.752032 
2010            598       592       29.508678  30.230162  29.882624  0.183076   29.889242 
2011            598       592       28.472645  29.089193  28.88962   0.126445   28.896548 
2012            598       592       28.250195  28.951225  28.620688  0.178611   28.594887 
2013            598       592       27.977032  28.351549  28.182516  0.118085   28.194275 
2014            598       592       27.490065  27.995031  27.70914   0.142533   27.72258  
2015            598       592       27.731806  28.071259  27.926504  0.049133   27.928016 
2016            598       592       27.716322  28.063194  27.845525  0.067569   27.832516 
2017            598       592       27.910452  28.396097  28.206499  0.158679   28.26758  
2018            598       592       28.016678  28.410872  28.237882  0.076309   28.242629 
2019            598       592       28.350775  28.730709  28.533507  0.106808   28.540161 
2020            598       592       29.251032  30.278452  29.768224  0.242567   29.69313  
2021            598       592       29.337999  30.654741  30.123994  0.271087   30.059516 
2022            598       592       28.644194  29.112516  28.951035  0.097921   28.95571  
2023            598       592       28.581741  29.651354  29.103279  0.283459   29.050114