Year	1=low to 6=high
2005	3.1052631578947367
2006	3.1052631578947367
2007	3.1052631578947367
2008	3.0789473684210527
2009	3.15
2010	3.275
2011	3.375
2012	3.35
2013	3.35
2014	3.275
2015	3.25
2016	3.225
2017	3.25
2018	3.325
2019	3.375
2020	3.4
2021	3.45
2022	3.55
2023	3.55