Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1320      1260      11.134022  11.454602  11.317414  0.064409   11.340045 
2008            1320      1260      11.211349  11.55203   11.393677  0.064564   11.405059 
2009            1320      1260      10.911647  11.242737  11.054133  0.062247   11.059248 
2010            1320      1260      11.616093  11.953546  11.843627  0.074747   11.867193 
2011            1320      1260      11.477596  11.726066  11.610336  0.045484   11.621837 
2012            1320      1260      12.323612  12.657686  12.492814  0.055589   12.498005 
2013            1320      1260      11.754912  12.000164  11.880165  0.044988   11.883885 
2014            1320      1260      10.862819  11.215079  11.083037  0.064576   11.089163 
2015            1320      1260      11.342022  11.616756  11.510914  0.05191    11.514152 
2016            1320      1260      12.123951  12.381279  12.250775  0.033355   12.256922 
2017            1320      1260      11.367816  11.59992   11.488538  0.046739   11.488789 
2018            1320      1260      11.434767  11.565452  11.497369  0.027447   11.501571 
2019            1320      1260      11.321879  11.495263  11.388252  0.025291   11.387011 
2020            1320      1260      11.948732  12.299763  12.103744  0.067053   12.106201 
2021            1320      1260      12.211578  12.557179  12.370122  0.059236   12.371415 
2022            1320      1260      12.091791  12.456923  12.270019  0.073649   12.27417  
2023            1320      1260      12.105221  12.53038   12.32686   0.08708    12.333242