73% (1973)

57% (1974)

65% (1976)

52% (1975)

53% (1971)

50% (1974)

68% (1979)

54% (1968)

45% (1970)

63% (1971)

67% (1986)

50% (1970)

38% (1972)

59% (1979)

59% (1977)

39% (1969)

53% (1970)

0% (1987)

58% (1969)

38% (1981)