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.
Bold, dotted lines show trendlines for each country. Light-shaded lines show available data, with earliest and latest datapoints represented for each country.
