61% (1971)

48% (1977)

59% (1972)

59% (1972)

74% (1972)

53% (1972)

40% (1971)

64% (1971)

61% (1976)

76% (1973)

73% (1973)

65% (1976)

64% (1972)

62% (1973)

68% (1973)

51% (1973)

55% (1972)

42% (1972)

62% (1973)

70% (1972)