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