Year	Percent
1995	52.44
1996	54.17
1997	53.69
1998	60.52
1999	55.55
2000	56.96
2001	52.56
2002	49.13
2003	51.09
2004	52.53
2005	47.13
2006	46.25
2007	50.85
2008	51.12
2009	39.41
2010	40.11