49% (1981)

54% (1982)

35% (1982)

44% (1980)

40% (1974)

38% (1984)

40% (1976)

67% (1984)

57% (1980)

42% (1983)

60% (1986)

38% (1976)

10% (1979)

0% (1979)

37% (1981)

0% (1979)

0% (1987)