34% (1958)

50% (1959)

52% (1976)

54% (1967)

49% (1979)

33% (1964)

55% (1976)

50% (1963)

60% (1976)

50% (1979)

42% (1968)

70% (1965)

44% (1970)

57% (1957)

39% (1956)

52% (1973)

43% (1958)

55% (1958)

0% (1972)

54% (1959)