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. 2018 Feb 8;11(1):1423861. doi: 10.1080/16549716.2018.1423861

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The work of Daniel Goodkind, Lisa Lollock and Loraine West was authored as part of their official duties as Employees of the United States Government and is therefore a work of the United States Government. In accordance with 17 USC. 105, no copyright protection is available for such works under US Law. Yoonjoung Choi and Thomas McDevitt waive their right to assert copyright, but not their right to be named as co-authors in the article.

This is an Open Access article that has been identified as being free of known restrictions under copyright law, including all related and neighboring rights (http://creativecommons.org/licenses/by/4.0/). You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

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Figure 1. — Total fertility rate in 2030: Reference and 75% benchmark projections. The total fertility rate (TFR) is the expected number of births per woman’s reproductive lifetime.