49% (1971)

62% (1986)

71% (1988)

64% (1987)

36% (1985)

69% (1989)

63% (1986)

55% (1985)

69% (1987)

57% (1987)

46% (1987)

47% (1986)

56% (1986)

63% (1985)

66% (1982)

57% (1989)

53% (1984)

55% (1987)

57% (1988)

60% (1986)