72% (1966)

71% (1968)

69% (1965)

63% (1968)

58% (1966)

60% (1969)

63% (1972)

52% (1968)

66% (1971)

60% (1973)

53% (1971)

57% (1967)

30% (1974)

39% (1975)

65% (1970)

49% (1972)

0% (1969)

44% (1975)

58% (1973)

50% (1967)