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