51% (1971)

70% (1968)

40% (1969)

35% (1974)

58% (1947)

63% (1966)

55% (1965)

70% (1973)

65% (1963)

60% (1948)

27% (1972)

57% (1973)

70% (1962)

80% (1961)

66% (1954)

62% (1958)

70% (1972)

36% (1962)

48% (1966)

60% (1970)