Year	1=low to 6=high
2005	4.5
2006	4.5
2007	4.5
2008	4.5
2009	4.5
2010	4.5
2011	4
2012	4
2013	4
2014	3.5
2015	3.5
2016	3.5
2017	3
2018	3
2019	3
2020	3
2021	2.5
2022	2.5
2023	2.5