69% (1998)

76% (2000)

68% (2000)

61% (1999)

63% (1997)

57% (2000)

62% (2000)

60% (2000)

55% (2000)

71% (1999)

65% (1999)

61% (1999)

64% (1997)

57% (1997)

60% (1999)

59% (1997)

63% (1998)

54% (2001)

58% (1998)

62% (2001)