48% (2007)

62% (1984)

69% (1982)

72% (1996)

76% (1987)

66% (1981)

70% (1976)

61% (1984)

69% (1974)

69% (1997)

65% (1995)

70% (1983)

73% (1975)

65% (2000)

63% (1976)

57% (1982)

56% (2007)

68% (1975)

53% (1982)

76% (1973)