64% (1987)

69% (1987)

56% (1986)

46% (1987)

59% (1986)

71% (1988)

57% (1989)

62% (1986)

63% (1990)

45% (1971)

63% (1985)

57% (1987)

69% (1989)

63% (1982)

63% (1984)

64% (1983)

58% (1985)

53% (1986)

59% (1984)

54% (1990)