The author is unknown and we don't know the people behind the website
Accuracy
We don't know the information source. Strange comments at the bottom raise concerns.
Objectivity
The chart itself is OK, but comments at the bottom reveal a potential bias.
Currency
The data is from 2011, which may be OK.
Coverage
This is not 100% on target, but the focus on caffeine covers most of the list
Wipe that smile off your face and get back to work!
Overall
We don't know where this data comes from. The strange comments at the bootm really make me wonder how much care was put into creating this web page. This is not a good article to rely upon.