Year	1=low to 6=high
2005	3.07
2006	3.0392156862745097
2007	3.0392156862745097
2008	3.0588235294117645
2009	3.056603773584906
2010	3.0943396226415096
2011	3.090909090909091
2012	3.1052631578947367
2013	3.0689655172413794
2014	3.1120689655172415
2015	3.1293103448275863
2016	3.0964912280701755
2017	3.0689655172413794
2018	3.0964912280701755
2019	3.1440677966101696
2020	3.163793103448276
2021	3.1228070175438596
2022	3.1440677966101696
2023	3.1440677966101696