Year	Percent
2002	60.90343
2003	62.46973
2004	77.43802
2005	78.69934
2006	75.9596
2007	61.72708
2008	48.88179
2009	45.28302
2010	50.68836
2011	61.25512
2012	63.64847
2013	66.96429
2014	66.39053
2015	68.38156
2016	71.90016