Year	Percent
1995	32.86
1996	39.12
1997	35.13
1998	34.81
1999	31.19
2000	27.62
2001	27.51
2002	24.83
2003	27.16
2004	30.32
2005	25.54
2006	27.16
2007	26.74
2008	28.73
2009	26.95
2010	28.26