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Historical Values
Year Value
1990 15% (1987)
1991 15% (1987)
1992 15% (1987)
1993 13% (1990)
1994 13% (1990)
1995 13% (1990)
1996 24.1% (1993 est.)
1997 24.1% (1993 est.)
1998 24.1% (1993 est.)
1999 25.7% (1997 est.)
2000 21.4% (1998 est.)
2001 21.4% (1998)
2002 21.4% (1998) (1998)
2003 22% (2001)
2004 22% (2001)
2005 22% (2001)
2006 19.2% (December 2003)