Year	Percent
1995	49.5
1996	53.41
1997	55.76
1998	58.19
1999	59.11
2000	61.72
2001	64.43
2002	64.17
2003	63.77
2004	62.03
2005	61.23
2006	59.35
2007	53.07
2008	50.05
2009	47.5
2010	46.4