63% (2004)

77% (2002)

62% (2006)

71% (1999)

65% (1997)

57% (1999)

52% (2000)

66% (1991)

70% (1999)

68% (1997)

64% (1998)

40% (1997)

60% (2006)

61% (2003)

63% (2001)

65% (1997)

72% (1998)

45% (1999)

66% (1996)

57% (2004)