Even semi-sweetened carbonated water seems to have exploded with White Claw going mainstream.
> A 12-ounce White Claw also has 100 calories, 2g of sugars, and 2g of carbs.
Unsweetened, flavored carbonated water really became cool recently rather than just something people drank when they were taking a break from alcohol or coca cola. I'd be dumbfounded if numbers didn't back this up among people 25-40 in the past 5 years.