52% (1981)

54% (1982)

40% (1976)

60% (1986)

67% (1984)

35% (1982)

49% (1976)

44% (1980)

40% (1974)

38% (1984)

0% (1979)

37% (1981)

57% (1980)

42% (1983)

10% (1979)

0% (1987)

0% (1979)