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