Year	Percent
1995	31.46
1996	43.71
1997	45.4
1998	46.81
1999	49.91
2000	53.82
2001	53.27
2002	51.25
2003	45.81
2004	37.85
2005	33.86
2006	31.59
2007	29.75
2008	30.97
2009	26.49
2010	24.16