73% (1991)

57% (1992)

80% (1994)

60% (1990)

77% (1991)

57% (1991)

46% (1991)

72% (1992)

48% (1993)

67% (1992)

58% (1993)

66% (1992)

58% (1990)

58% (1993)

59% (1992)

58% (1990)

61% (1993)

58% (1992)

69% (1990)

69% (1991)