78% (1994)

67% (1987)

66% (1994)

67% (2008)

78% (1983)

76% (2000)

78% (1989)

75% (2008)

69% (1998)

70% (2001)

66% (2009)

63% (2012)

67% (2007)

59% (1993)

59% (1998)

64% (2009)

70% (2005)

52% (2010)

64% (2009)

63% (1995)