78% (1994)

73% (1991)

62% (1983)

56% (1985)

78% (1988)

73% (1984)

59% (1986)

82% (1993)

54% (1979)

73% (1979)

65% (1988)

68% (1986)

50% (1994)

72% (1992)

45% (1991)

61% (1987)

50% (1986)

60% (1988)

54% (1983)

60% (1979)