74% (1997)

73% (1995)

66% (1997)

74% (1998)

54% (1995)

67% (1998)

74% (1999)

65% (1993)

64% (1992)

62% (1997)

50% (1996)

67% (1998)

55% (1999)

57% (1997)

54% (1996)

62% (1993)

50% (1996)

54% (1998)

54% (2000)

58% (1998)