70% (1990)

61% (1993)

74% (1993)

65% (1992)

43% (1988)

65% (1987)

48% (1995)

72% (1987)

62% (1986)

0% (1994)

59% (1993)

70% (1996)

70% (1989)

65% (1992)

67% (1989)

57% (1986)

38% (1980)

70% (1995)

57% (1993)

69% (1995)