56% (1971)

58% (1969)

51% (1980)

65% (1959)

55% (1966)

49% (1965)

58% (1965)

53% (1966)

37% (1955)

51% (1975)

52% (1971)

50% (1976)

63% (1961)

59% (1972)

50% (1976)

35% (1990)

56% (1958)

65% (1975)

59% (1976)

52% (1977)