Year	Percent
2000	77.02193
2001	69.61501
2002	76.87916
2003	76.98893
2004	77.75063
2005	75.9711
2006	76.57766
2007	78.58911
2008	83.64717
2009	85.09322
2010	85.05314
2011	85.63961
2012	86.62444
2013	86.79171
2014	87.97614
2015	87.55767
2016	87.42861
2017	86.85461