Year	1=low to 6=high
2005	3.1315789473684212
2006	3.1578947368421053
2007	3.236842105263158
2008	3.236842105263158
2009	3.225
2010	3.25
2011	3.375
2012	3.425
2013	3.425
2014	3.375
2015	3.375
2016	3.475
2017	3.525
2018	3.55
2019	3.55
2020	3.55
2021	3.575
2022	3.6
2023	3.6