63% (1978)

67% (1979)

62% (1990)

65% (1951)

67% (1949)

60% (1986)

73% (1982)

50% (1963)

57% (1965)

58% (1988)

66% (1985)

55% (1969)

59% (1967)

51% (1966)

77% (1971)

50% (1974)

60% (1975)

74% (1971)

62% (1982)

60% (1963)