73% (2005)

56% (1992)

56% (1985)

65% (1982)

54% (1972)

69% (1979)

68% (1988)

70% (1995)

61% (1982)

72% (2001)

64% (1982)

35% (1985)

65% (1990)

61% (1983)

40% (1981)

66% (1995)

64% (1982)

80% (1979)

72% (1986)

0% (1978)