62% (1983)

53% (1979)

49% (1991)

49% (1988)

46% (1988)

60% (1980)

60% (1984)

47% (1982)

30% (1986)

47% (1985)

60% (1985)

54% (1988)

15% (1988)

55% (1984)

40% (1985)

47% (1986)

37% (1987)

60% (1987)

42% (1986)

55% (1986)