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