Year	Percent
1995	26.04
1996	25.7
1997	25.12
1998	25.59
1999	27.97
2000	25.97
2001	23.87
2002	23.18
2003	22.79
2004	22.72
2005	23.9
2006	24.82
2007	25.8
2008	27.64
2009	30.27
2010	29.17