74% (2000)

64% (2004)

72% (1999)

70% (2001)

78% (1997)

68% (1993)

77% (2001)

69% (1997)

48% (2004)

57% (1988)

59% (1990)

52% (1999)

60% (1998)

80% (2002)

70% (2001)

62% (1999)

30% (2002)

67% (1996)

0% (1998)

100% (1995)