69% (1959)

42% (1969)

66% (1987)

59% (1977)

67% (1984)

45% (1964)

48% (1970)

55% (1969)

55% (1968)

51% (1979)

56% (1973)

46% (1971)

69% (1976)

60% (1969)

61% (1974)

63% (1989)

43% (1957)

80% (1969)

50% (1962)

77% (1950)