48% (1973)

61% (1978)

55% (1971)

45% (1966)

59% (1976)

40% (1949)

10% (1980)

55% (1974)

46% (1970)

49% (1991)

62% (1971)

68% (1984)

67% (1980)

0% (1991)

49% (1956)

0% (1986)

66% (1983)

67% (1988)

61% (1979)

57% (1984)