20% (1983)

20% (2002)

40% (1996)

20% (1995)

20% (1999)

65% (1999)

20% (1993)

20% (1997)

20% (1985)

20% (1983)

40% (1986)

20% (1990)

70% (1995)

20% (1998)

20% (1985)

20% (1990)

20% (1996)

20% (1994)

20% (1992)

20% (1987)