Year	Percent
1995	41.47
1996	41.77
1997	44.07
1998	32.07
1999	26.84
2000	20.39
2001	20.71
2002	20.24
2003	20.41
2004	21.94
2005	23.65
2006	23.08
2007	22.16
2008	24.56
2009	24.94
2010	26.66