73% (1973)

68% (1963)

63% (1975)

70% (1962)

66% (1964)

61% (1994)

61% (1966)

52% (2000)

62% (1972)

69% (1978)

70% (1986)

57% (1987)

61% (1978)

70% (1981)

72% (1982)

65% (1966)

61% (1973)

63% (1964)

62% (1961)

56% (2004)