Year	1=low to 6=high
2005	2.5
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	3
2016	3
2017	3
2018	3
2019	3
2020	3
2021	3
2022	2.5
2023	2.5