72% (1991)

76% (1994)

61% (1987)

73% (1984)

55% (1985)

60% (1988)

57% (1991)

54% (1979)

78% (1988)

59% (1986)

82% (1993)

73% (1979)

72% (1992)

62% (1983)

65% (1988)

54% (1983)

45% (1991)

66% (1986)

58% (1980)

60% (1979)