Year	1=low to 6=high
2005	2.9565217391304346
2006	2.94
2007	3.02
2008	3.04
2009	3.076923076923077
2010	3.0384615384615383
2011	3.0535714285714284
2012	2.966666666666667
2013	3.032258064516129
2014	3.064516129032258
2015	3.064516129032258
2016	2.903225806451613
2017	2.78125
2018	2.7903225806451615
2019	2.75
2020	2.765625
2021	2.774193548387097
2022	2.78125
2023	2.71875