58% (1980)

50% (1978)

67% (2004)

41% (1974)

72% (1973)

67% (1969)

58% (1982)

38% (1977)

73% (1981)

49% (1979)

20% (1985)

47% (1977)

54% (1983)

58% (1981)

40% (1972)

52% (1979)

59% (1975)

49% (1979)

65% (1970)

58% (1967)