Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            310       302       27.858322  28.47913   28.207288  0.160089   28.21563  
2008            310       302       27.204355  28.418806  27.917648  0.355929   27.953081 
2009            310       302       27.914646  28.451742  28.166154  0.118873   28.146436 
2010            310       302       29.538742  29.868032  29.760658  0.092488   29.790129 
2011            310       302       28.67342   29.773806  29.176046  0.303361   29.147226 
2012            310       302       28.696548  29.309547  29.057915  0.142225   29.081    
2013            310       302       27.644386  28.536903  28.049582  0.288032   28.030532 
2014            310       302       27.192936  28.338581  27.628672  0.336969   27.534226 
2015            310       302       26.912258  27.304483  27.040099  0.099737   27.020759 
2016            310       302       27.242838  28.278257  27.723532  0.337946   27.698049 
2017            310       302       28.759903  29.632839  29.23258   0.250771   29.237339 
2018            310       302       27.445032  27.803871  27.548905  0.09772    27.511081 
2019            310       302       28.213581  29.222225  28.70632   0.30294    28.684484 
2020            310       302       29.235903  29.723097  29.511791  0.087751   29.507887 
2021            310       302       29.233032  29.676805  29.49369   0.096308   29.505145 
2022            310       302       28.559225  29.506193  29.06659   0.25017    29.109565 
2023            310       302       28.423967  29.520161  28.882303  0.250133   28.845887