Year	1=low to 6=high
2005	3.121944444444444
2006	3.083333333333334
2007	3.1067708333333335
2008	3.103125
2009	3.118434343434344
2010	3.1159090909090916
2011	3.1396464646464644
2012	3.1093137254901966
2013	3.1063725490196075
2014	3.1224755555555554
2015	3.0944452525252535
2016	3.059343535353536
2017	3.0129901960784315
2018	3.042171717171717
2019	3.0088235196078434
2020	3.015441176470589
2021	3.0356060606060606
2022	3.021568647058824
2023	3.034558882352942