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Historical Values
Year Value
1990 25% (1983)
1991 38% (1987)
1992 38% (1987)
1993 31.3% (1990)
1994 31.3% (1990)
1995 31.3% (1990)
1996 31.3% (1995)
1997 31.3% (1995)
1998 31.3% (1995)
1999 29.5% (1997)
2000 27.8% (1998)
2001 27.8% (1998)
2002 27.8% (1998) (1998)
2003 27.8% (1998)
2004 27.8% (1998)
2005 27.8% (1998)
2006 26.9% (2003)