Year	1=low to 6=high
2005	3.700000000000001
2006	3.6783333333333337
2007	3.7631944444444447
2008	3.775
2009	3.741666666666667
2010	3.734615384615385
2011	3.6442307692307705
2012	3.5779761904761913
2013	3.5547619047619046
2014	3.384091818181818
2015	3.3613630303030306
2016	3.360605454545455
2017	3.3613636363636386
2018	3.3636363636363655
2019	3.4143938181818188
2020	3.375
2021	3.3991665000000006
2022	3.3924999
2023	3.4091665