73% (1973)

51% (1974)

65% (1976)

57% (1974)

54% (1968)

67% (1986)

45% (1970)

59% (1977)

68% (1979)

53% (1970)

63% (1971)

52% (1975)

38% (1981)

53% (1971)

32% (1972)

62% (1968)

46% (1980)

0% (1972)

59% (1979)

49% (1977)