Year	1=low to 6=high
2005	2.82
2006	2.7941176470588234
2007	2.7941176470588234
2008	2.784313725490196
2009	2.7830188679245285
2010	2.7452830188679247
2011	2.827272727272727
2012	2.807017543859649
2013	2.8189655172413794
2014	2.8448275862068964
2015	2.810344827586207
2016	2.789473684210526
2017	2.75
2018	2.754385964912281
2019	2.76271186440678
2020	2.75
2021	2.745614035087719
2022	2.7203389830508473
2023	2.6779661016949152