66% (1975)

73% (1976)

73% (1975)

65% (1975)

64% (1976)

76% (1972)

65% (1973)

50% (1969)

61% (1975)

62% (1973)

61% (1975)

63% (1972)

70% (1970)

64% (1975)

55% (1969)

46% (1969)

60% (1969)

55% (1971)

69% (1973)

47% (1966)