Year	1=low to 6=high
2005	2.5
2006	3
2007	3
2008	3
2009	3
2010	3
2011	3
2012	3
2013	3.5
2014	3.5
2015	3
2016	2.5
2017	2.5
2018	2.5
2019	2.5
2020	2.5
2021	2.5
2022	2.5
2023	2.5