Year	Percent
1995	65.51
1996	53.62
1997	51.95
1998	49.53
1999	47.53
2000	43.65
2001	44.29
2002	46.23
2003	52.12
2004	60.46
2005	64.78
2006	63.27
2007	69.16
2008	68.01
2009	72.46
2010	74.79