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