Year	Percent
1995	40.03
1996	38.15
1997	40.87
1998	43.76
1999	46.58
2000	53.56
2001	57.12
2002	54.02
2003	57.91
2004	57.19
2005	60.91
2006	55.29
2007	56.74
2008	51.89
2009	53.55
2010	53.54