58% (1973)

51% (1966)

59% (1977)

39% (1986)

66% (1990)

30% (1989)

60% (1975)

40% (1962)

65% (1967)

40% (1949)

38% (1956)

67% (1938)

50% (1962)

64% (1968)

56% (1960)

55% (1974)

68% (1970)

48% (1980)

40% (1972)

48% (1947)