57% (1971)

20% (1972)

54% (1975)

50% (1974)

49% (1971)

53% (1978)

20% (1975)

10% (1973)

36% (1975)

40% (1971)

10% (1976)

54% (1970)

30% (1969)

55% (1967)

55% (1974)

64% (1975)

39% (1974)

52% (1973)

47% (1973)

40% (1971)