73% (1994)

62% (1997)

63% (1988)

57% (1993)

70% (1991)

90% (1984)

74% (1988)

71% (1990)

58% (1989)

60% (1987)

71% (1990)

62% (1996)

70% (1993)

60% (1998)

65% (1989)

72% (1992)

66% (1997)

63% (1985)

62% (1992)

63% (1994)