Year	Percent
1990	97.1
1991	97.1
1992	97.1
1993	97.2
1994	97.2
1995	97.3
1996	97.3
1997	97.3
1998	100
1999	100
2000	100
2001	100
2002	100
2003	100
2004	100
2005	100
2006	100
2007	100
2008	100
2009	100