Year	Percent
1995	62.07
1996	59.72
1997	58.39
1998	56.95
1999	53.33
2000	48.01
2001	48.33
2002	49.87
2003	49.39
2004	52.87
2005	52.75
2006	54.85
2007	59.84
2008	61.88
2009	70.3
2010	67.66