72% (1982)

55% (1989)

73% (1979)

68% (1975)

72% (1982)

68% (1975)

74% (1982)

50% (1993)

69% (1981)

68% (1994)

66% (1976)

64% (1984)

80% (1978)

67% (1979)

66% (1987)

63% (1976)

67% (1978)

57% (1979)

53% (1980)

73% (1981)