73% (2010)

70% (1992)

71% (2001)

67% (2001)

75% (2005)

66% (2005)

71% (2001)

76% (1999)

76% (2000)

68% (2007)

40% (1989)

62% (2001)

71% (2001)

68% (2001)

68% (2004)

51% (1987)

55% (2003)

61% (1990)

70% (2005)

47% (2001)