Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1281      519       30.294096  30.598612  30.487553  0.057543   30.494741 
2008            1281      519       28.489548  28.72216   28.590606  0.060784   28.578064 
2009            1281      519       29.631161  30.252323  29.84097   0.13917    29.82658  
2010            1281      519       30.289227  30.556227  30.40668   0.064183   30.396967 
2011            1281      519       31.257967  31.542194  31.450751  0.050472   31.452194 
2012            1281      519       29.692419  29.999645  29.82395   0.100138   29.789322 
2013            1281      519       29.577774  29.81613   29.684829  0.059951   29.693291 
2014            1281      519       30.375452  30.499613  30.425923  0.027005   30.428968 
2015            1281      519       30.265806  30.623096  30.45142   0.082967   30.454065 
2016            1281      519       30.049065  30.392742  30.183578  0.078668   30.161419 
2017            1281      519       30.036226  30.322193  30.154517  0.057865   30.143129 
2018            1281      519       29.875839  30.254517  30.001072  0.089855   29.977484 
2019            1281      519       29.849451  30.133032  29.982038  0.06517    29.958612 
2020            1281      519       30.214291  30.581936  30.385683  0.084944   30.359711 
2021            1281      519       30.887032  31.204355  31.089595  0.054934   31.089128 
2022            1281      519       29.787773  29.934065  29.852902  0.026311   29.850128 
2023            1281      519       31.69429   32.11013   32.001895  0.081961   32.021969