78% (1994)

67% (2008)

78% (1989)

68% (1998)

68% (2007)

76% (2000)

67% (1987)

78% (1984)

66% (2009)

62% (2012)

63% (2009)

66% (1994)

50% (1993)

70% (2005)

62% (1995)

59% (1998)

48% (2009)

74% (2001)

63% (2009)

50% (2009)