67% (1998)

70% (2000)

63% (1995)

66% (1998)

71% (1994)

78% (1994)

69% (1999)

70% (1999)

71% (1995)

63% (1997)

77% (1997)

53% (1998)

65% (1995)

65% (1994)

76% (2003)

64% (1998)

72% (1998)

50% (1989)

64% (2000)

69% (1993)