69% (1975)

68% (1970)

57% (1973)

69% (1972)

64% (1976)

63% (1972)

80% (1965)

54% (1978)

56% (1969)

55% (1969)

73% (1975)

50% (1974)

47% (1970)

60% (1973)

45% (1974)

60% (1978)

50% (1968)

10% (1972)

10% (1975)

50% (1973)