Year	1=low to 6=high
2005	3.36
2006	3.3137254901960786
2007	3.343137254901961
2008	3.3823529411764706
2009	3.349056603773585
2010	3.3679245283018866
2011	3.3363636363636364
2012	3.219298245614035
2013	3.163793103448276
2014	3.1120689655172415
2015	3.0775862068965516
2016	3.043859649122807
2017	3.043103448275862
2018	3.043859649122807
2019	3.0508474576271185
2020	3.0344827586206895
2021	3.017543859649123
2022	2.9237288135593222
2023	2.9237288135593222