Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Females are denoted by triangles, males by squares. More recent values are designated with stronger colors. A: England and Wales in 1841–2013, B: France in 1816–2013, C: Japan in 1947–2012, D: Sweden in 1751–2014.
