71% (1975)

67% (1976)

66% (1974)

55% (1975)

37% (1978)

49% (1975)

54% (1974)

57% (1976)

53% (1974)

50% (1974)

50% (1974)

20% (1979)

20% (1974)

39% (1975)

10% (1976)

30% (1974)

20% (1977)

0% (1975)