51% (1984)

40% (1983)

55% (1979)

58% (1984)

62% (1976)

47% (1979)

64% (1981)

58% (1984)

40% (1982)

0% (1977)

70% (1983)

53% (1979)

55% (1981)

43% (1984)

53% (1982)

40% (1978)

38% (1978)

71% (1982)

47% (1983)

56% (1980)