70% (1977)

70% (1969)

64% (1973)

55% (1969)

54% (1971)

58% (1969)

66% (1970)

61% (1968)

50% (1976)

50% (1973)

59% (1972)

59% (1975)

50% (1969)

66% (1976)

62% (1978)

53% (1969)

65% (1970)

48% (1970)

50% (1975)

45% (1974)