62% (1989)

54% (1956)

54% (1972)

51% (1977)

58% (1984)

62% (1975)

63% (1978)

51% (1976)

49% (1972)

57% (1971)

56% (1978)

64% (1966)

45% (1953)

42% (1972)

55% (1970)

54% (1985)

45% (1967)

67% (1966)

70% (1965)

63% (1964)