Year	1=low to 6=high
2005	3.38
2006	3.3627450980392157
2007	3.343137254901961
2008	3.3627450980392157
2009	3.4056603773584904
2010	3.4245283018867925
2011	3.418181818181818
2012	3.4035087719298245
2013	3.3793103448275863
2014	3.3793103448275863
2015	3.3879310344827585
2016	3.3859649122807016
2017	3.3620689655172415
2018	3.3596491228070176
2019	3.26271186440678
2020	3.2586206896551726
2021	3.254385964912281
2022	3.169491525423729
2023	3.1779661016949152