Year	1=low to 6=high
2005	3.1
2006	3
2007	3
2008	2.9
2009	2.9
2010	2.9
2011	2.9
2012	2.9
2013	2.9
2014	2.9
2015	2.9
2016	3
2017	3
2018	3
2019	3
2020	3.1
2021	3
2022	3
2023	3