57% (1975)

50% (1963)

45% (1994)

51% (1958)

50% (1966)

73% (1970)

57% (1972)

34% (1958)

54% (1956)

55% (1957)

54% (1959)

50% (1976)

56% (1975)

50% (1979)

50% (1968)

59% (1971)

49% (1964)

34% (1969)

58% (1980)

44% (1971)