Year	1=low to 6=high
2005	3.1031746031746033
2006	3.0384615384615383
2007	3.0615384615384613
2008	3.0615384615384613
2009	3.0597014925373136
2010	3.082089552238806
2011	3.101449275362319
2012	3.1056338028169015
2013	3.076388888888889
2014	3.1180555555555554
2015	3.138888888888889
2016	3.112676056338028
2017	3.0972222222222223
2018	3.1267605633802815
2019	3.164383561643836
2020	3.1986301369863015
2021	3.1666666666666665
2022	3.195945945945946
2023	3.189189189189189