27% (1964)

40% (1967)

66% (1971)

43% (1976)

35% (1970)

32% (1984)

50% (1969)

30% (1963)

39% (1970)

39% (1972)

49% (1968)

24% (1967)

42% (1971)

10% (1989)

40% (1990)

42% (1983)

55% (1981)

38% (1978)

10% (1984)

57% (1962)