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