73% (1973)

55% (1974)

50% (1974)

65% (1976)

63% (1971)

55% (1968)

53% (1971)

68% (1979)

44% (1970)

66% (1986)

52% (1970)

49% (1975)

54% (1967)

38% (1981)

59% (1979)

32% (1972)

0% (1989)

58% (1969)

50% (1970)

63% (1980)