84% (2002)

69% (1999)

74% (2000)

67% (1997)

51% (2001)

65% (2004)

70% (1996)

48% (2005)

71% (1999)

52% (2001)

51% (2002)

68% (2003)

49% (2003)

66% (2005)

72% (1995)

62% (1999)

57% (1997)

43% (1993)

54% (2006)

68% (2004)