Year	1=low to 6=high
2005	3.32
2006	3.3137254901960786
2007	3.3627450980392157
2008	3.3823529411764706
2009	3.349056603773585
2010	3.3962264150943398
2011	3.4909090909090907
2012	3.526315789473684
2013	3.543103448275862
2014	3.5517241379310347
2015	3.5517241379310347
2016	3.543859649122807
2017	3.5
2018	3.5701754385964914
2019	3.5254237288135593
2020	3.5172413793103448
2021	3.508771929824561
2022	3.5254237288135593
2023	3.5254237288135593