84% (2002)

74% (2000)

70% (1999)

67% (1997)

70% (1996)

51% (2001)

65% (2004)

71% (1999)

62% (1999)

49% (2003)

72% (1999)

48% (2005)

66% (2005)

72% (1995)

61% (1999)

57% (1997)

68% (2003)

56% (2006)

68% (2004)

61% (2001)