Year	1=low to 6=high
2005	2.5
2006	2
2007	1.5
2008	1.5
2009	2
2010	2
2011	2.5
2012	3
2013	3
2014	2.5
2015	2.5
2016	2.5
2017	2.5
2018	2.5
2019	2.5
2020	2.5
2021	2.5
2022	2.5
2023	2.5