Year	1=low to 6=high
2005	3.0789473684210527
2006	3
2007	3.1315789473684212
2008	3.210526315789474
2009	3.225
2010	3.275
2011	3.325
2012	3.4
2013	3.45
2014	3.45
2015	3.425
2016	3.35
2017	3.2
2018	3.175
2019	3.2
2020	3.25
2021	3.25
2022	3.325
2023	3.325