78% (1985)

64% (1977)

54% (1982)

63% (1981)

55% (1974)

62% (1959)

66% (1984)

55% (1976)

20% (1972)

59% (1965)

65% (1980)

60% (1966)

73% (1991)

68% (1970)

61% (1971)

77% (1976)

69% (1983)

40% (1975)

53% (1965)

90% (1979)