Year	1=low to 6=high
2005	2.66
2006	2.62
2007	2.64
2008	2.66
2009	2.6799999999999997
2010	2.6599999999999997
2011	2.6599999999999997
2012	2.64
2013	2.6399999999999997
2014	2.6399999999999997
2015	2.62
2016	2.6199999999999997
2017	2.4000000000000004
2018	2.54
2019	2.4499999999999997
2020	2.4333333333333336
2021	2.35
2022	2.3
2023	2.3