52% (1979)

68% (1976)

61% (1982)

35% (1981)

55% (1986)

60% (1978)

75% (1978)

20% (1983)

72% (1981)

71% (1979)

0% (1980)

25% (1985)

54% (1985)

60% (1979)

0% (1986)

55% (1978)

0% (1980)

20% (1982)

20% (1982)

20% (1982)