69% (1998)

62% (2005)

47% (2007)

52% (1997)

59% (2003)

68% (2002)

47% (2002)

63% (2004)

57% (2003)

19% (2007)

70% (1992)

73% (2004)

32% (2006)

71% (2007)

66% (1999)

50% (2006)

60% (2001)

83% (1993)

65% (1995)

55% (2006)