73% (1992)

52% (1982)

76% (1987)

48% (2007)

66% (1981)

62% (1984)

72% (1996)

61% (1984)

57% (1982)

73% (1975)

69% (1982)

69% (1974)

62% (1976)

70% (1976)

69% (1997)

71% (1983)

64% (1984)

68% (1985)

69% (1985)

56% (2007)