Year	1=low to 6=high
2005	2.8
2006	2.8
2007	2.9
2008	2.9
2009	2.9
2010	2.9
2011	2.9
2012	2.9
2013	2.8
2014	2.8
2015	2.8
2016	2.8
2017	2.8
2018	2.8
2019	2.8
2020	2.8
2021	2.8
2022	2.8
2023	2.7