75% (1997)

66% (1997)

73% (1995)

75% (1999)

74% (1998)

57% (1997)

54% (1995)

65% (1993)

54% (1999)

54% (1996)

52% (1996)

67% (1998)

63% (1992)

54% (2000)

68% (1998)

76% (1994)

62% (1997)

59% (1996)

44% (1992)

43% (1996)