55% (1966)

54% (1966)

40% (1961)

53% (1970)

60% (1968)

34% (1980)

48% (1973)

58% (1974)

44% (1974)

53% (1963)

49% (1966)

37% (1967)

58% (1965)

43% (1967)

56% (1971)

52% (1966)

38% (1955)

56% (1974)

48% (1958)

52% (1976)