54% (1975)

58% (1971)

42% (1971)

55% (1978)

64% (1975)

52% (1973)

54% (1970)

55% (1974)

36% (1975)

55% (1967)

44% (1973)

10% (1976)

30% (1969)

48% (1974)

40% (1970)

0% (1966)

38% (1974)

10% (1973)

40% (1971)

20% (1975)