Year	1=low to 6=high
2005	2.5
2006	3
2007	3
2008	3
2009	3
2010	3
2011	3
2012	2.5
2013	2
2014	2
2015	2.5
2016	3
2017	3
2018	3
2019	3
2020	3
2021	3.5
2022	3.5
2023	3.5