Year	1=low to 6=high
2005	3.5555555555555554
2006	3.5945945945945947
2007	3.608108108108108
2008	3.581081081081081
2009	3.6052631578947367
2010	3.6184210526315788
2011	3.6052631578947367
2012	3.5921052631578947
2013	3.539473684210526
2014	3.526315789473684
2015	3.473684210526316
2016	3.4324324324324325
2017	3.4210526315789473
2018	3.4594594594594597
2019	3.4078947368421053
2020	3.4210526315789473
2021	3.445945945945946
2022	3.3684210526315788
2023	3.4078947368421053