45% (1978)

68% (1976)

70% (1975)

66% (1974)

56% (1976)

54% (1975)

53% (1974)

52% (1975)

39% (1975)

10% (1976)

54% (1974)

48% (1974)

50% (1974)

23% (1979)

20% (1977)

0% (1975)

30% (1974)

20% (1974)