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