61% (1971)

40% (1978)

30% (1977)

37% (1976)

50% (1975)

76% (1977)

60% (1977)

0% (1976)

66% (1977)

60% (1971)

62% (1980)

60% (1970)

0% (1974)

53% (1974)

60% (1975)

0% (1979)

40% (1980)

57% (1971)

50% (1981)

72% (1983)