Year	1=low to 6=high
2005	2.5
2006	2.5
2007	2.5
2008	2
2009	2
2010	2
2011	2.5
2012	2.5
2013	2.5
2014	2.5
2015	2.5
2016	2.5
2017	2.5
2018	2.5
2019	3
2020	3
2021	3
2022	2.5
2023	2.5