Year	Percent
1995	24.65
1996	24.65
1997	23.88
1998	25.36
1999	25.41
2000	25.26
2001	26.63
2002	23.12
2003	24.99
2004	27.32
2005	29.93
2006	32.92
2007	34.82
2008	35.14
2009	35.17
2010	36.43