73% (2010)

67% (2001)

71% (1992)

71% (2001)

66% (2005)

76% (1999)

71% (2001)

68% (2001)

62% (2001)

76% (2000)

68% (2004)

40% (1989)

61% (1990)

42% (2005)

66% (1995)

68% (2007)

70% (2005)

58% (2006)

75% (2003)

64% (1995)