Year	1=low to 6=high
2005	3.33
2006	3.323529411764706
2007	3.343137254901961
2008	3.323529411764706
2009	3.3773584905660377
2010	3.452830188679245
2011	3.4363636363636365
2012	3.3771929824561404
2013	3.353448275862069
2014	3.3448275862068964
2015	3.3189655172413794
2016	3.289473684210526
2017	3.2844827586206895
2018	3.3157894736842106
2019	3.3220338983050848
2020	3.353448275862069
2021	3.3859649122807016
2022	3.3728813559322033
2023	3.3559322033898304