71% (1988)

61% (1986)

68% (1985)

66% (1980)

68% (1985)

65% (1986)

73% (1987)

61% (1984)

77% (1986)

60% (1986)

61% (1990)

63% (1992)

57% (1990)

64% (1988)

69% (1987)

0% (1988)

51% (1991)

68% (1984)

54% (1991)

62% (1984)