Year	Percent
1995	39.23
1996	46.85
1997	44.75
1998	46.9
1999	45.9
2000	49.76
2001	53.31
2002	55.04
2003	57.73
2004	55.82
2005	55.99
2006	50.48
2007	47.14
2008	44.99
2009	41.54
2010	37.81