Year	1=low to 6=high
2005	3.11
2006	3.107843137254902
2007	3.1176470588235294
2008	3.1372549019607843
2009	3.19811320754717
2010	3.2264150943396226
2011	3.209090909090909
2012	3.1491228070175437
2013	3.1293103448275863
2014	3.163793103448276
2015	3.1293103448275863
2016	3.1052631578947367
2017	3.043103448275862
2018	3.06140350877193
2019	3.0254237288135593
2020	2.9827586206896552
2021	2.956140350877193
2022	2.9491525423728815
2023	2.9322033898305087