Year	1=low to 6=high
2005	3.21
2006	3.156862745098039
2007	3.215686274509804
2008	3.196078431372549
2009	3.169811320754717
2010	3.1320754716981134
2011	3.1272727272727274
2012	3.1140350877192984
2013	3.1120689655172415
2014	3.103448275862069
2015	3.060344827586207
2016	3.0350877192982457
2017	2.9655172413793105
2018	2.956140350877193
2019	2.889830508474576
2020	2.8793103448275863
2021	2.93859649122807
2022	2.940677966101695
2023	2.940677966101695