44% (1988)

48% (1977)

56% (1988)

62% (1977)

47% (1978)

46% (1987)

21% (1972)

39% (1990)

38% (1972)

43% (1989)

39% (1987)

52% (1976)

54% (1985)

46% (1971)

37% (1973)

52% (1981)

43% (1972)

55% (1985)

50% (1970)

45% (1985)