71% (1992)

74% (2002)

54% (2005)

52% (2008)

67% (2008)

66% (2007)

67% (1974)

70% (1988)

60% (1999)

67% (1989)

78% (2004)

76% (1999)

73% (1994)

70% (2002)

68% (1993)

71% (2004)

76% (1986)

57% (2001)

70% (1979)

62% (1976)