Year	Percent
2005	74.52491
2006	71.98783
2007	70.23013
2008	70.36009
2009	71.65466
2010	75.57647
2011	74.12842
2012	77.56004
2013	78.64424
2014	79.67638
2015	77.60864
2016	77.62432