62% (1981)

70% (1965)

65% (1964)

63% (1965)

62% (1963)

53% (1980)

70% (1967)

62% (1976)

66% (1973)

56% (1972)

70% (1980)

67% (1964)

64% (1965)

71% (1967)

63% (1975)

58% (1970)

73% (1971)

63% (1982)

52% (1980)

69% (1981)