Year	Percent
1995	42.38
1996	50.29
1997	48.23
1998	48.63
1999	51.52
2000	55.72
2001	58.86
2002	60.45
2003	62.11
2004	59.17
2005	59.11
2006	53.84
2007	50.85
2008	51.6
2009	46.96
2010	43.81