Year	1=low to 6=high
2005	3.5789473684210527
2006	3.5789473684210527
2007	3.6842105263157894
2008	3.6578947368421053
2009	3.65
2010	3.675
2011	3.75
2012	3.775
2013	3.7
2014	3.65
2015	3.575
2016	3.525
2017	3.6
2018	3.625
2019	3.6
2020	3.625
2021	3.65
2022	3.625
2023	3.7