Year	1=low to 6=high
2005	3.3999999999999995
2006	3.405555555555556
2007	3.4425287356321843
2008	3.3862068965517236
2009	3.43103448275862
2010	3.4195402298850572
2011	3.3999999999999995
2012	3.377777777777778
2013	3.370967741935484
2014	3.361111111111111
2015	3.2944441111111114
2016	3.293103103448276
2017	3.275862068965517
2018	3.270114942528735
2019	3.275862022988506
2020	3.2586206896551717
2021	3.247126413793103
2022	3.2413792758620694
2023	3.21839075862069