37% (1976)

30% (1985)

62% (1994)

59% (1994)

50% (1979)

30% (1998)

67% (1975)

82% (1982)

65% (1973)

61% (2001)

40% (1969)

66% (1990)

55% (1973)

40% (2002)

50% (1992)

32% (1983)

52% (1980)

47% (1999)

66% (1971)

60% (1978)