Clearly data is going to be a bit out of date, but that was the best I could find last night when I had a quick look.
I've found this from 2016 now, which shows, Brazil is still more than Vietnam.
http://ec.europa.eu/eurostat/web/products-eurostat-news/-/EDN-20170929-1
Interestingly the amount imported into the EU is only up 10% on 10 years ago. So the amount of coffee we're drinking doesn't seem to be going up dramatically... just perhaps the way we drink it and the amount we pay for it.
"In 2016, the European Union (EU) imported almost 3 million tonnes of coffee from abroad, 10% more than 10 years ago. The imports were worth €6.9 billion."