51% (1974)

40% (1975)

62% (1981)

65% (1991)

30% (1981)

49% (1966)

50% (1958)

72% (1982)

38% (1947)

56% (1965)

33% (1990)

42% (1940)

33% (1985)

48% (1976)

57% (1974)

51% (1982)

63% (1982)

67% (1981)

60% (1987)

78% (1985)