68% (1974)

42% (1958)

74% (1981)

49% (1979)

56% (1972)

62% (1964)

44% (1967)

64% (1977)

37% (1970)

51% (1970)

65% (1963)

62% (1966)

63% (1964)

43% (1963)

56% (1975)

44% (1973)

65% (1972)

48% (1960)

60% (1966)

65% (1968)