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	4.5
2012	4.5
2013	4
2014	4
2015	3.5
2016	2.5
2017	2.5
2018	2.5
2019	2
2020	2.5
2021	2.5
2022	3
2023	3