75% (1972)

77% (1973)

47% (1977)

54% (1972)

59% (1972)

64% (1971)

67% (1973)

58% (1972)

62% (1971)

65% (1972)

61% (1976)

41% (1972)

43% (1971)

70% (1972)

62% (1973)

73% (1973)

65% (1976)

51% (1973)

62% (1973)

55% (1972)