63% (2004)

62% (2006)

71% (1999)

57% (1999)

70% (1999)

64% (2001)

66% (1997)

64% (1998)

62% (2003)

67% (1998)

76% (2002)

62% (1997)

72% (1998)

70% (2001)

66% (1991)

69% (1999)

20% (1990)

41% (1997)

69% (1989)

66% (1996)