35% (1980)

40% (1961)

62% (1976)

55% (1976)

46% (1974)

43% (1956)

48% (1973)

55% (1967)

42% (1978)

56% (1974)

56% (1971)

40% (1970)

38% (1957)

51% (1976)

51% (1958)

10% (1975)

0% (1962)

50% (1979)

49% (1964)

60% (1976)