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