Year	1=low to 6=high
2005	3.0555555555555554
2006	3.0276923076923077
2007	3.0384615384615383
2008	3.038461538461539
2009	3.06268656716418
2010	3.0701492537313437
2011	3.0782608695652187
2012	3.0478873239436615
2013	3.0347222222222223
2014	3.044444444444444
2015	3.0402777777777765
2016	3.033802816901408
2017	3.002777777777778
2018	3.0183098591549293
2019	2.9986301369863018
2020	2.986301369863013
2021	2.984722222222223
2022	2.9513513513513527
2023	2.943243243243244