44% (1976)

67% (1963)

57% (1974)

56% (1971)

49% (1977)

57% (1967)

69% (1975)

55% (1972)

51% (1963)

66% (1973)

63% (1962)

51% (1969)

51% (1976)

50% (1976)

59% (1972)

60% (1965)

71% (1965)

48% (1970)

56% (1970)

46% (1977)