Year	1=low to 6=high
2005	3.12
2006	3.0619047619047617
2007	3.0857142857142854
2008	3.09047619047619
2009	3.0772727272727267
2010	3.127272727272727
2011	3.177272727272727
2012	3.1130434782608694
2013	3.0869565217391304
2014	3.0913043478260867
2015	3.0913043478260875
2016	3.0521739130434784
2017	3.0000000000000004
2018	3.0608695652173914
2019	3.0500000000000003
2020	3.0749999999999993
2021	3.0782608695652174
2022	3.058333333333333
2023	3.054166666666667