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.
Sample: 2004M1 - 2011M5. The turning points for each series is highlighted by a vertical line of the same color. Google data are registered trademarks of Google Inc., used with permission.
