54% (1986)

76% (1980)

54% (1983)

46% (1985)

62% (1981)

62% (1990)

52% (1971)

64% (1983)

61% (1980)

45% (1984)

61% (1981)

47% (1984)

65% (1990)

56% (1979)

62% (1981)

38% (1986)

59% (1983)

60% (1980)

62% (1982)

63% (1982)