Year	Overall average
2004	64.4444444444444
2005	64.4444444444444
2006	57.7777777777778
2007	61.1111111111111
2008	61.1111111111111
2009	62.2222222222222
2010	65.5555566666667
2011	68.8888888888889
2012	70
2013	70
2014	70
2015	70
2016	80
2017	78.8889
2018	77.7777666666667