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