60% (1971)

68% (1966)

54% (1963)

71% (1970)

73% (1967)

66% (1972)

63% (1970)

66% (1972)

66% (1971)

50% (1964)

44% (1979)

58% (1973)

46% (1967)

62% (1968)

56% (1964)

53% (1965)

49% (1974)

49% (1967)

0% (1971)

58% (1968)