64% (1971)

50% (1967)

69% (1972)

54% (1971)

58% (1967)

56% (1974)

60% (1972)

54% (1974)

64% (1973)

60% (1973)

52% (1967)

54% (1970)

51% (1976)

47% (1972)

43% (1966)

65% (1974)

60% (1965)

53% (1977)

60% (1981)

64% (1965)