Year	Percent
1995	24.63
1996	22.36
1997	25.65
1998	26.24
1999	27.15
2000	26.67
2001	22.57
2002	22.66
2003	21.33
2004	28.94
2005	27.93
2006	25.64
2007	22.68
2008	20.46
2009	20.71
2010	22.11