Year	1=low to 6=high
2005	2.9
2006	2.9
2007	3
2008	2.9
2009	2.9
2010	3
2011	3.2
2012	3
2013	3
2014	3
2015	2.9
2016	2.9
2017	2.9
2018	3
2019	3
2020	3
2021	3
2022	3
2023	3.1