Year	1=low to 6=high
2005	1.5
2006	1.5
2007	1.5
2008	1.5
2009	2
2010	2
2011	2.5
2012	2.5
2013	2.5
2014	2.5
2015	3
2016	3
2017	3
2018	3.5
2019	3.5
2020	3.5
2021	4
2022	4
2023	4