The following image was downloaded from Statista. Here's the information provided by the databases (including the MLA citation below generated for you!)

1. Creator's name: Nike
2. Title of the work, as given: Nike's North American Revenue from 2009 to 2016, by Segment (in Million U.S. Dollars) 
3. Location of the work: Statista 
4. Date: July 2016 
5. Database collection, if known: Statista - the Statistics Portal
6. Rights information, if known. Unknown

This image includes much of the information I would include in a caption - but if you download a chart or graph without this info included, be sure to caption it as well. 

The MLA Citation for this chart is: 

Nike. "Nike's North American Revenue from 2009 to 2016, by Segment (in Million U.S. Dollars)." Statista - The Statistics Portal. Statista. July 2016. Web. 30 Aug 2016.