70% (1977)

70% (1969)

55% (1969)

50% (1969)

66% (1970)

59% (1972)

64% (1973)

61% (1968)

58% (1969)

54% (1971)

50% (1975)

66% (1976)

45% (1974)

65% (1970)

61% (1968)

55% (1972)

68% (1976)

48% (1970)

59% (1972)

67% (1969)