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