72% (1973)

57% (1974)

54% (1967)

45% (1970)

65% (1976)

38% (1981)

0% (1972)

49% (1974)

50% (1970)

52% (1982)

54% (1968)

39% (1969)

58% (1969)

0% (1970)

59% (1977)

69% (1979)

59% (1979)

62% (1980)

65% (1972)

65% (1971)