47% (1991)

46% (1988)

62% (1983)

70% (1986)

42% (1986)

53% (1988)

60% (1987)

65% (1987)

53% (1979)

46% (1987)

47% (1982)

42% (1987)

51% (1984)

54% (1987)

60% (1980)

40% (1988)

53% (1987)

40% (1985)

45% (1988)

47% (1986)