72% (1976)

61% (1996)

62% (1983)

64% (1988)

60% (1980)

62% (1978)

58% (1978)

65% (1982)

72% (1966)

63% (1980)

64% (1990)

52% (1975)

65% (1986)

73% (1989)

65% (1990)

69% (1988)

47% (1995)

55% (1982)

60% (1995)

50% (1979)