20% (1972)

54% (1975)

49% (1971)

55% (1974)

57% (1971)

53% (1978)

50% (1974)

10% (1973)

20% (1975)

54% (1970)

36% (1975)

40% (1971)

55% (1967)

47% (1973)

30% (1969)

10% (1976)

40% (1971)

64% (1975)

45% (1964)

52% (1973)