What decade brought an exceptionally large number of women into the labor force?

Question

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The 1970s brought about a significant increase in the number of women entering the labor force due to a variety of factors, including the women's liberation movement, the introduction of birth control, and changes in cultural attitudes towards working women. The percentage of women in the labor force increased from 43% in 1970 to 52% in 2000.

What Decade Brought an Exceptionally Large Number of Women into the Labor