61% (2003)

61% (1979)

52% (1994)

74% (1993)

66% (1992)

61% (2000)

66% (2009)

71% (1981)

59% (2007)

65% (1995)

67% (1977)

63% (2006)

67% (1976)

66% (2009)

65% (1997)

72% (1975)

55% (1985)

70% (1977)

59% (1992)

67% (2008)