65% (1987)

59% (1986)

62% (1986)

46% (1987)

56% (1986)

63% (1985)

66% (1982)

70% (1985)

63% (1982)

57% (1989)

57% (1987)

48% (1986)

59% (1984)

55% (1985)

62% (1985)

58% (1987)

55% (1987)

61% (1988)

58% (1985)

33% (1984)