48% (1970)

44% (1972)

70% (1956)

55% (1957)

55% (1949)

55% (1959)

62% (1963)

61% (1964)

70% (1959)

55% (1960)

63% (1972)

51% (1954)

67% (1978)

62% (1989)

63% (1958)

56% (1989)

59% (1969)

56% (1957)

56% (1969)

77% (1962)