62% (1983)

49% (1988)

45% (1988)

60% (1984)

47% (1985)

47% (1982)

60% (1980)

49% (1991)

55% (1984)

15% (1988)

53% (1979)

65% (1986)

65% (1987)

60% (1987)

40% (1988)

42% (1987)

55% (1986)

50% (1987)

42% (1986)

63% (1987)