Year	Percent
1995	50.41
1996	51.23
1997	54.91
1998	47.98
1999	49.8
2000	42.79
2001	35.41
2002	35.24
2003	36.46
2004	36.95
2005	38.22
2006	38.95
2007	34.12
2008	29.68
2009	33.88
2010	31.22