42% (1971)

55% (1967)

40% (1973)

10% (1976)

58% (1971)

55% (1975)

20% (1975)

52% (1973)

54% (1970)

36% (1975)

40% (1971)

50% (1974)

30% (1969)

54% (1978)

40% (1970)

38% (1974)

63% (1975)

10% (1973)

55% (1974)

45% (1964)