Year	1=low to 6=high
2005	2.789473684210526
2006	2.8157894736842106
2007	2.8157894736842106
2008	2.789473684210526
2009	2.775
2010	2.775
2011	2.8
2012	2.725
2013	2.775
2014	2.75
2015	2.8
2016	2.825
2017	2.85
2018	2.85
2019	2.9
2020	2.925
2021	2.95
2022	2.875
2023	2.925