74% (2002)

71% (1992)

62% (1976)

78% (2004)

70% (2002)

52% (2008)

67% (1989)

67% (2008)

61% (1995)

60% (1999)

76% (1999)

71% (1988)

71% (2004)

69% (1971)

54% (2005)

73% (1994)

76% (1986)

63% (1997)

70% (1979)

60% (1972)