Year	1=low to 6=high
2005	3.425
2006	3.426829268292683
2007	3.451219512195122
2008	3.4390243902439024
2009	3.475609756097561
2010	3.4878048780487805
2011	3.4404761904761907
2012	3.4285714285714284
2013	3.4302325581395348
2014	3.4634146341463414
2015	3.4634146341463414
2016	3.4078947368421053
2017	3.3815789473684212
2018	3.3684210526315788
2019	3.41025641025641
2020	3.4342105263157894
2021	3.4210526315789473
2022	3.4615384615384617
2023	3.4615384615384617