An official website of the United States government Here’s how you know

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.

Year

* Drag and draw a rectangle on the bottom chart to see the detailed usage statistics. Click anywhere on it to reset the chart.

Extreme Values occured at the following months:
Month: Value
April 2008:628508
April 2013: 12942065
May 2014:619032
September 2014:801442
The data has been scaled to better display the typical results.