38% (1970)

48% (1969)

29% (1964)

57% (1962)

20% (1987)

35% (1975)

55% (1973)

23% (1968)

49% (1979)

48% (1968)

55% (1981)

32% (1978)

30% (1978)

0% (1964)

66% (1971)

42% (1971)

35% (1988)

48% (1975)

40% (1973)

45% (1971)