Year	1=low to 6=high
2005	3.8111111111111104
2006	3.793333333333334
2007	3.930555555555556
2008	4.008333333333334
2009	3.9871794871794872
2010	3.974358974358974
2011	3.8461538461538463
2012	3.773809523809524
2013	3.7380952380952372
2014	3.5606054545454553
2015	3.484846666666667
2016	3.545453636363636
2017	3.515151515151517
2018	3.46969696969697
2019	3.4242425454545455
2020	3.400000000000001
2021	3.4333335000000007
2022	3.4333335000000007
2023	3.4500002000000003