64% (1971)

74% (1972)

53% (1972)

59% (1972)

62% (1971)

40% (1971)

62% (1973)

64% (1972)

42% (1972)

59% (1972)

76% (1973)

49% (1977)

73% (1973)

70% (1972)

65% (1976)

67% (1973)

61% (1976)

55% (1972)

62% (1973)

51% (1973)