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