60% (1984)

62% (1983)

46% (1988)

47% (1991)

53% (1988)

55% (1984)

53% (1979)

42% (1987)

54% (1987)

47% (1982)

55% (1987)

47% (1986)

55% (1986)

65% (1987)

40% (1988)

45% (1988)

60% (1980)

0% (1988)

60% (1982)

43% (1987)