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In page Women in engineering in the United States:

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In 1999, women made up approximately one quarter of all engineers under the age of 25, whereas they constituted one-twentieth of those over age 49. This age discrepancy has been attributed to women's notable, but recent, movement into engineering within the past few decades.[2] According to the Society of Women Engineers, women and other minorities constituted approximately 16%-17% of engineering graduate students from 1990 to 2003. Furthermore, in 2003 approximately 20% (approximately 12,000)of new engineers were women, compared with about 80% of men (approximately 49,000).[citation needed]