Year	Percent
1995	22.3
1996	23.82
1997	24.97
1998	24.48
1999	24.34
2000	25.99
2001	26.71
2002	26.63
2003	28.12
2004	26.89
2005	27.85
2006	27.73
2007	27.74
2008	26.56
2009	26.59
2010	26.34