67% (1970)

62% (1974)

54% (1963)

49% (1968)

55% (1975)

54% (1968)

51% (1968)

50% (1965)

50% (1992)

63% (1966)

63% (1966)

50% (1962)

58% (1976)

49% (1976)

53% (1968)

53% (1965)

47% (1966)

50% (1975)

54% (1962)

50% (1963)