Year	1=low to 6=high
2005	3
2006	3.0392156862745097
2007	3.0588235294117645
2008	2.9901960784313726
2009	2.981132075471698
2010	2.9622641509433962
2011	2.981818181818182
2012	2.9035087719298245
2013	2.8706896551724137
2014	2.8706896551724137
2015	2.810344827586207
2016	2.763157894736842
2017	2.75
2018	2.7719298245614037
2019	2.7711864406779663
2020	2.7155172413793105
2021	2.692982456140351
2022	2.7033898305084745
2023	2.7203389830508473