How many energy drinks in US market?

[BC Beer/Energy]

I have heard there are thousands of energy drinks in the US market. How many of these drinks actually succeed? In Canada we were only approved for energy drink sale last year(officially). There are about 4 major energy drinks for sale in Vancouver/Toronto now with a flood coming in soon.

[The Interpreter]

If there are only four, the fifth person who wants one is going to get awfully thirsty! I bet there are millions of them on the shelves in the US of A!