Year	1=low to 6=high
2005	3.026315789473684
2006	2.9210526315789473
2007	2.973684210526316
2008	3.026315789473684
2009	3
2010	3
2011	3
2012	2.95
2013	2.925
2014	2.925
2015	2.975
2016	3.025
2017	3.025
2018	2.975
2019	2.975
2020	3.025
2021	3.05
2022	3.1
2023	3.175