Year	1=low to 6=high
2005	2.716666666666667
2006	2.6875
2007	2.65625
2008	2.625
2009	2.590909090909091
2010	2.5757575757575757
2011	2.621212121212121
2012	2.5441176470588234
2013	2.5441176470588234
2014	2.606060606060606
2015	2.5606060606060606
2016	2.5606060606060606
2017	2.514705882352941
2018	2.5454545454545454
2019	2.573529411764706
2020	2.573529411764706
2021	2.5606060606060606
2022	2.5588235294117645
2023	2.485294117647059