Year	1=low to 6=high
2005	3.61
2006	3.627450980392157
2007	3.656862745098039
2008	3.5980392156862746
2009	3.6037735849056602
2010	3.6226415094339623
2011	3.590909090909091
2012	3.5350877192982457
2013	3.4827586206896552
2014	3.4741379310344827
2015	3.4224137931034484
2016	3.3947368421052633
2017	3.3879310344827585
2018	3.412280701754386
2019	3.3983050847457625
2020	3.3879310344827585
2021	3.3859649122807016
2022	3.288135593220339
2023	3.288135593220339