66% (1975)

72% (1975)

65% (1973)

65% (1975)

72% (1976)

62% (1975)

75% (1972)

62% (1972)

61% (1975)

62% (1973)

59% (1972)

63% (1975)

58% (1971)

64% (1976)

55% (1971)

58% (1972)

60% (1969)

35% (1969)

62% (1977)

50% (1969)