69% (1998)

68% (2002)

33% (2006)

60% (2003)

19% (2007)

66% (1999)

60% (2000)

57% (1996)

52% (1997)

63% (2004)

70% (1992)

64% (2005)

60% (2003)

50% (2006)

41% (2004)

47% (2002)

85% (1993)

74% (2004)

55% (2006)

48% (1999)