71% (2010)

61% (1991)

69% (1971)

66% (1974)

41% (1996)

64% (1977)

53% (1992)

66% (1994)

61% (1990)

62% (2005)

70% (1988)

64% (1988)

79% (1995)

71% (1992)

66% (1994)

70% (2010)

62% (2004)

57% (1999)

65% (1984)

75% (1980)