Year	Percent
1990	61
1991	61
1992	62
1993	62
1994	63
1995	63
1996	64
1997	64
1998	64
1999	64.5
2000	62
2001	64
2002	64
2003	64.6
2004	64.7
2005	65.04
2006	65.28
2007	65.36
2008	65.47