68% (1986)

63% (1990)

74% (1987)

68% (1988)

68% (1987)

69% (1985)

58% (1986)

78% (1986)

63% (1989)

55% (1991)

55% (1991)

67% (1980)

60% (1986)

59% (1984)

70% (1984)

61% (1982)

70% (1987)

70% (1987)

30% (1986)

66% (1988)