52% (1966)

57% (1971)

57% (1958)

10% (1975)

46% (1969)

46% (1956)

40% (1964)

38% (1963)

48% (1958)

40% (1972)

45% (1968)

47% (1957)

56% (1971)

43% (1967)

58% (1971)

62% (1974)

48% (1965)

58% (1975)

36% (1958)

50% (1963)