45% (1968)

38% (1968)

52% (1977)

65% (1975)

55% (1976)

51% (1974)

43% (1978)

49% (1964)

0% (1963)

57% (1957)

34% (1958)

39% (1956)

40% (1960)

47% (1975)

46% (1956)

51% (1976)

54% (1964)

42% (1978)

32% (1959)

56% (1974)