37% (1976)

62% (1994)

60% (1978)

59% (1994)

30% (1985)

40% (2002)

67% (1975)

66% (1971)

50% (1992)

62% (1988)

52% (1980)

62% (1972)

47% (1974)

57% (2002)

82% (1982)

50% (1979)

38% (1999)

30% (1998)

47% (1999)

0% (1976)