Year	Percent
1995	59.97
1996	61.85
1997	59.13
1998	56.24
1999	53.42
2000	46.44
2001	42.88
2002	45.98
2003	42.09
2004	42.81
2005	39.09
2006	44.71
2007	43.26
2008	48.11
2009	46.45
2010	46.46