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