35% (1998)

69% (1998)

20% (1988)

60% (1993)

57% (1989)

20% (1996)

0% (1989)

20% (1988)

47% (1983)

20% (1997)

60% (1999)

20% (1986)

0% (1991)

40% (2001)

20% (1993)

50% (1989)

43% (1987)

55% (2002)

40% (1986)

20% (1985)