43% (1976)

38% (1991)

48% (1992)

33% (1990)

35% (1967)

20% (1971)

27% (1964)

46% (1962)

57% (1962)

60% (1964)

23% (1967)

42% (1991)

43% (1971)

15% (1969)

66% (1971)

36% (1970)

30% (1989)

42% (1971)

45% (1978)

49% (1968)