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