42% (1969)

62% (1977)

65% (1989)

66% (1987)

56% (1973)

69% (1959)

55% (1968)

60% (1969)

72% (1981)

64% (1982)

29% (1958)

80% (1969)

71% (1986)

45% (1964)

46% (1971)

55% (1969)

78% (1950)

41% (1979)

46% (1963)

60% (1951)