Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            890       875       30.319225  30.522451  30.44086   0.041308   30.446968 
2008            890       875       28.481031  28.72871   28.605628  0.038691   28.604807 
2009            890       875       29.956839  30.395258  30.197628  0.10768    30.22242  
2010            890       875       30.331678  30.733999  30.551251  0.108899   30.560646 
2011            890       875       31.21529   31.474419  31.359481  0.07273    31.382065 
2012            890       875       29.807741  30.137613  29.980099  0.076701   29.97587  
2013            890       875       29.761969  30.050741  29.95187   0.06995    29.96629  
2014            890       875       30.374453  30.597775  30.512326  0.051734   30.523903 
2015            890       875       30.267967  30.54929   30.408562  0.076797   30.404806 
2016            890       875       29.842871  30.123516  29.989286  0.063472   29.992128 
2017            890       875       30.199194  30.355257  30.27459   0.04006    30.265903 
2018            890       875       30.072903  30.318096  30.173381  0.070022   30.152388 
2019            890       875       29.803129  30.045387  29.925677  0.044208   29.925711 
2020            890       875       30.250645  30.483807  30.390241  0.047991   30.394096 
2021            890       875       30.763355  31.11484   30.972504  0.08191    30.973354 
2022            890       875       29.775517  30.001516  29.883038  0.057062   29.889257 
2023            890       875       31.831194  32.165031  32.011838  0.071796   32.009064