71% (1963)

67% (1965)

75% (1963)

75% (1970)

73% (1975)

78% (1964)

73% (1964)

55% (1972)

77% (1967)

60% (1973)

63% (1965)

55% (1971)

42% (1975)

58% (1965)

59% (1967)

61% (1963)

60% (1973)

64% (1967)

64% (1973)

50% (1974)