Caffiene Content

Does anyone know how I can find the caffiene content of drinks (like redbull, coke, stuff like that) Surely they have to publish it somewhere right?
 
it should be pretty easy to find. i would imagine if you googled it, it would come right up, almost every other food does. I do know that 1 8.5 oz can of Red Bull has 80 mg.
 
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