Year	Percent
1995	23.32
1996	17.32
1997	21.1
1998	17.76
1999	18.82
2000	20.84
2001	24.04
2002	26.56
2003	26.8
2004	23.9
2005	23.6
2006	22.99
2007	22.44
2008	20.44
2009	25.9
2010	29.62