73% (1966)

77% (1963)

65% (1967)

52% (1978)

58% (1966)

48% (1975)

43% (1963)

50% (1962)

50% (1968)

60% (1973)

58% (1962)

45% (1978)

44% (1966)

40% (1964)

73% (1965)

52% (1968)

44% (1975)

60% (1966)

49% (1972)

52% (1959)