76% (1991)

80% (1994)

47% (1991)

73% (1991)

61% (1990)

67% (1992)

67% (1992)

59% (1990)

58% (1990)

57% (1992)

57% (1991)

58% (1993)

58% (1992)

59% (1992)

69% (1990)

72% (1992)

62% (1991)

48% (1993)

61% (1993)

69% (1994)