Year	Percent
1995	55.36
1996	58.62
1997	53.25
1998	38.96
1999	39.39
2000	31.25
2001	34.49
2002	33.72
2003	22.15
2004	22.99
2005	22.32
2006	23.81
2007	24.27
2008	26.53
2009	34.88
2010	37.21