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. Author manuscript; available in PMC: 2014 Oct 20.
Published in final edited form as: Brookings Pap Econ Act. 2013 Spring;2013:341–409. doi: 10.1353/eca.2013.0001

Figure 1. Incidence of Terms Related to Contraception in Google Books, 1900–2008a.

Figure 1

Source: Author’s tabulations using http://books.google.com/ngrams

a. FDA = Food and Drug Administration; OEO = Office of Economic Opportunity.

b. Words when only “contraception is used; bigrams when more than two words are used. A bigram is two consecutive words. Counts include both capitalized and lowercase occurrences.