Year	1=low to 6=high
2009	3
2010	3.5
2011	4
2012	4
2013	4
2014	3.5
2015	3.5
2016	3.5
2017	3.5
2018	3.5
2019	3.5
2020	3.5
2021	3.5
2022	3.5
2023	3.5