69% (1963)

66% (1964)

73% (1973)

70% (1962)

68% (1972)

61% (1994)

71% (1986)

63% (1975)

70% (1981)

61% (1978)

69% (1965)

61% (1972)

72% (1982)

68% (1978)

61% (1973)

70% (1988)

62% (1964)

53% (2000)

56% (1987)

62% (1977)