Year	1=low to 6=high
2005	3.34
2006	3.3137254901960786
2007	3.323529411764706
2008	3.323529411764706
2009	3.3207547169811322
2010	3.330188679245283
2011	3.290909090909091
2012	3.2719298245614037
2013	3.2672413793103448
2014	3.25
2015	3.2413793103448274
2016	3.1842105263157894
2017	3.146551724137931
2018	3.175438596491228
2019	3.194915254237288
2020	3.2155172413793105
2021	3.2280701754385963
2022	3.2288135593220337
2023	3.23728813559322