76% (1953)

61% (1972)

71% (1973)

60% (1968)

66% (1971)

64% (1965)

72% (1973)

72% (1965)

57% (1976)

46% (1971)

63% (1968)

76% (1976)

53% (1976)

65% (1974)

45% (1966)

50% (1967)

54% (1977)

61% (1957)

0% (1953)

50% (1967)