74% (1972)

63% (1971)

58% (1972)

47% (1977)

73% (1973)

77% (1973)

65% (1972)

54% (1972)

62% (1971)

43% (1971)

67% (1973)

59% (1972)

61% (1976)

65% (1976)

62% (1973)

41% (1972)

55% (1972)

51% (1973)

70% (1972)

60% (1972)