62% (1981)

40% (1981)

58% (1981)

50% (1983)

70% (1983)

44% (1983)

50% (1984)

64% (1982)

15% (1981)

0% (1983)

59% (1982)

60% (1983)

55% (1984)

30% (1982)

40% (1978)

50% (1982)

30% (1980)

45% (1979)

52% (1980)

40% (1963)