Year	1=low to 6=high
2005	3.06
2006	3.0294117647058822
2007	3.019607843137255
2008	3.0588235294117645
2009	3.0377358490566038
2010	3.047169811320755
2011	2.9727272727272727
2012	2.9298245614035086
2013	2.8879310344827585
2014	2.8793103448275863
2015	2.8793103448275863
2016	2.8947368421052633
2017	2.8706896551724137
2018	2.8684210526315788
2019	2.847457627118644
2020	2.8793103448275863
2021	2.9298245614035086
2022	2.9322033898305087
2023	2.9661016949152543