Year	1=low to 6=high
2005	3.37
2006	3.303921568627451
2007	3.3137254901960786
2008	3.372549019607843
2009	3.358490566037736
2010	3.311320754716981
2011	3.290909090909091
2012	3.236842105263158
2013	3.25
2014	3.293103448275862
2015	3.293103448275862
2016	3.210526315789474
2017	3.1724137931034484
2018	3.1491228070175437
2019	3.1186440677966103
2020	3.1379310344827585
2021	3.0964912280701755
2022	3.0762711864406778
2023	3.042372881355932