61% (1971)

59% (1972)

40% (1971)

58% (1972)

53% (1972)

74% (1972)

48% (1977)

64% (1972)

76% (1973)

62% (1973)

63% (1971)

61% (1976)

60% (1972)

68% (1973)

42% (1972)

65% (1976)

70% (1972)

51% (1973)

62% (1973)

73% (1973)