Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            495       426       22.875324  23.313547  23.197893  0.094175   23.222656 
2008            495       426       22.546776  23.01354   22.888977  0.100347   22.915751 
2009            495       426       22.451561  23.003954  22.853736  0.120741   22.884994 
2010            495       426       22.380129  22.966145  22.763929  0.128797   22.771263 
2011            495       426       22.683146  23.200541  23.055397  0.110492   23.084413 
2012            495       426       23.056803  23.475519  23.366896  0.09235    23.393591 
2013            495       426       22.738092  23.361233  23.131582  0.145488   23.150984 
2014            495       426       22.162691  22.809576  22.600135  0.144032   22.618361 
2015            495       426       23.297642  23.844107  23.677437  0.124707   23.698823 
2016            495       426       23.341768  23.898478  23.712814  0.126338   23.738045 
2017            495       426       23.198528  23.839767  23.59892   0.154132   23.617733 
2018            495       426       23.371944  23.934538  23.75774   0.128737   23.782649 
2019            495       426       23.295227  23.859039  23.686772  0.129125   23.72141  
2020            495       426       23.237307  23.726368  23.563636  0.108103   23.581435 
2021            495       426       22.452682  23.081835  22.858476  0.155208   22.884032 
2022            495       426       22.588736  23.499895  23.178904  0.208892   23.206205 
2023            495       426       23.125885  23.769873  23.549507  0.144827   23.577261