60% (1988)

55% (1991)

61% (1986)

74% (1991)

71% (1984)

80% (1984)

62% (1984)

72% (1982)

62% (1990)

70% (1987)

67% (1990)

62% (1988)

69% (1994)

52% (1986)

54% (1983)

60% (1988)

69% (1990)

50% (1988)

52% (1986)

59% (1990)