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