40% (1964)

55% (1968)

50% (1978)

59% (1974)

50% (1948)

48% (1967)

71% (1960)

74% (1966)

62% (1981)

50% (1955)

55% (1991)

71% (1965)

60% (1962)

50% (1961)

49% (1985)

60% (1968)

50% (1953)

57% (1967)

50% (1975)

50% (1949)