73% (1966)

65% (1967)

77% (1963)

60% (1973)

58% (1966)

48% (1975)

58% (1962)

53% (1968)

33% (1961)

49% (1972)

45% (1978)

52% (1959)

46% (1975)

44% (1966)

50% (1962)

40% (1972)

59% (1963)

44% (1975)

52% (1978)

43% (1963)