Year	1=low to 6=high
2005	2.795652173913044
2006	2.7320000000000007
2007	2.724
2008	2.7120000000000006
2009	2.765384615384616
2010	2.7807692307692315
2011	2.8035714285714284
2012	2.7600000000000002
2013	2.7419354838709675
2014	2.7709677419354843
2015	2.75483870967742
2016	2.7483870967741937
2017	2.6843749999999997
2018	2.7064516129032254
2019	2.665625
2020	2.646875
2021	2.5967741935483866
2022	2.553125
2023	2.50625