72% (1973)

49% (1974)

57% (1974)

65% (1976)

54% (1968)

69% (1979)

52% (1982)

65% (1971)

52% (1971)

45% (1970)

50% (1970)

67% (1986)

62% (1980)

59% (1977)

55% (1981)

32% (1972)

59% (1979)

54% (1967)

58% (1969)

62% (1968)