Year	1=low to 6=high
2005	3.351851851851851
2006	3.3621621621621625
2007	3.3873873873873874
2008	3.402702702702703
2009	3.3947368421052637
2010	3.403508771929825
2011	3.4385964912280698
2012	3.4342105263157894
2013	3.3859649122807016
2014	3.372807280701754
2015	3.3377194736842095
2016	3.274774954954955
2017	3.236842105263159
2018	3.238738738738739
2019	3.214912289473684
2020	3.219298245614035
2021	3.2207207027027027
2022	3.162280710526316
2023	3.166666657894737