Dear Mr. Robertson,
Thank you for posting your request on History Hub!
We suggest that you review the US Voting and Election Resources; US Election Statistics: A Resource Guide; Voting and Registration; Who's More Likely to Vote: Women or Men?; and United States Presidential Election Results websites for the information and/or resources about the percentages of women and men who voted in past national elections.
We hope this is helpful. Best of luck with your research!