71% (1992)

73% (2010)

66% (2001)

71% (2001)

66% (1999)

77% (1999)

77% (2000)

71% (2001)

66% (2005)

62% (2001)

72% (2000)

74% (2005)

56% (2003)

59% (2006)

51% (1987)

59% (2006)

68% (2004)

66% (1995)

42% (1989)

62% (1990)