Year	Percent
1995	29.22
1996	29.42
1997	29.15
1998	29.65
1999	29.25
2000	27.49
2001	25.35
2002	25.5
2003	25.51
2004	24.04
2005	23.8
2006	23.42
2007	23.45
2008	22.49
2009	22.12
2010	22.38