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