<span>increased from 10% in 1976 to 20% in 2006
These type of women usually choose not to have children on their own due to time (if those women choose to not have children in order to pursue a certain lifestyle or career) or genetic factors (if those women had a physiological condition where they can't have children or having one will expose them to a certain amount of risk)
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WW2 I believe/think. That would be my answer.
A accuracy is the answer ( ´ ▽ ` )
A cause and effect due to process of elimination and the text
