72% (1973)

65% (1974)

68% (1976)

65% (1975)

64% (1977)

67% (1973)

63% (1975)

55% (1975)

63% (1975)

51% (1971)

50% (1978)

65% (1972)

60% (1979)

54% (1977)

60% (1972)

50% (1953)

0% (1962)

58% (1975)

0% (1978)

70% (1972)