44% (1987)

45% (1983)

57% (1985)

60% (1984)

54% (1973)

45% (1985)

57% (1986)

62% (1975)

39% (1984)

63% (1971)

55% (1967)

49% (1969)

58% (1970)

62% (1968)

37% (1988)

69% (1969)

51% (1971)

18% (1971)

20% (1987)

48% (1974)