Year	Percent
1995	29.23
1996	31.2
1997	29.57
1998	27.93
1999	26.73
2000	26.9
2001	29.99
2002	30.33
2003	31.33
2004	32.16
2005	32.01
2006	30.2
2007	29.63
2008	28.55
2009	29.25
2010	25.81