Year	Percent
1995	32.23
1996	31.87
1997	27.98
1998	29.22
1999	28.84
2000	29.42
2001	32.17
2002	25.97
2003	26.56
2004	27.41
2005	28.37
2006	32.76
2007	36.31
2008	36.87
2009	38.75
2010	37.96