Year	1=low to 6=high
2005	3.418918918918919
2006	3.3378378378378377
2007	3.364864864864865
2008	3.3783783783783785
2009	3.3815789473684212
2010	3.3552631578947367
2011	3.3815789473684212
2012	3.358974358974359
2013	3.358974358974359
2014	3.3815789473684212
2015	3.4210526315789473
2016	3.4210526315789473
2017	3.3846153846153846
2018	3.3684210526315788
2019	3.2948717948717947
2020	3.282051282051282
2021	3.269230769230769
2022	3.2435897435897436
2023	3.2435897435897436