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