63% (2004)

62% (2006)

71% (1999)

69% (1999)

57% (1999)

72% (1998)

64% (1998)

67% (1998)

69% (1999)

76% (2002)

69% (2001)

66% (1997)

62% (2003)

63% (2001)

66% (1996)

60% (2006)

66% (1991)

67% (1997)

63% (1997)

45% (2011)