68% (1988)

59% (1986)

68% (1987)

69% (1985)

74% (1987)

68% (1980)

69% (1985)

63% (1992)

63% (1990)

60% (1986)

68% (1986)

78% (1986)

69% (1988)

66% (1988)

64% (1989)

70% (1987)

62% (1984)

55% (1991)

75% (1985)

70% (1987)