Year	Percent
1995	34.51
1996	32.61
1997	33.04
1998	35.02
1999	35.16
2000	30.95
2001	31.46
2002	30.48
2003	32.07
2004	27.4
2005	26.4
2006	32.9
2007	39.98
2008	33.96
2009	37.54
2010	37.84