Year	1=low to 6=high
2005	3
2006	3.026315789473684
2007	3.0789473684210527
2008	3.0789473684210527
2009	3.075
2010	3.05
2011	3.025
2012	2.975
2013	2.975
2014	2.9
2015	2.875
2016	2.775
2017	2.775
2018	2.775
2019	2.7
2020	2.7
2021	2.65
2022	2.725
2023	2.75