43% (1989)

39% (1990)

47% (1988)

52% (1977)

47% (1978)

56% (1988)

45% (1985)

40% (1974)

43% (1972)

52% (1986)

50% (1970)

42% (1986)

25% (1981)

55% (1983)

37% (1979)

44% (1988)

44% (1988)

48% (1977)

39% (1987)

57% (1976)