Year	Percent
1995	61.52
1996	58.28
1997	55.63
1998	50.99
1999	49.83
2000	51.37
2001	45.08
2002	46.29
2003	47.57
2004	47.41
2005	47.09
2006	44.69
2007	44.18
2008	44.05
2009	41.82
2010	41.03