Year	1=low to 6=high
2005	3.360377358490567
2006	3.3370370370370384
2007	3.3596153846153856
2008	3.371698113207546
2009	3.3870370370370364
2010	3.4148148148148154
2011	3.3890909090909083
2012	3.3982142857142854
2013	3.385964912280703
2014	3.3750000000000004
2015	3.36923076923077
2016	3.3469387755102047
2017	3.3469387755102034
2018	3.3571428571428568
2019	3.3720000000000003
2020	3.379166666666667
2021	3.3833333333333333
2022	3.408163265306123
2023	3.4183673469387763