Year	Percent
1995	46.98
1996	48.6
1997	46.43
1998	44.71
1999	42.52
2000	36.77
2001	34.55
2002	37.41
2003	34.35
2004	34.83
2005	31.52
2006	36.08
2007	34.8
2008	38.47
2009	37.13
2010	37.21