I have no idea, but I also doubt that's the most effective metric for determining people buying/being sold, US culture. I think you'd have to sample a wide range of metrics to gauge how well US culture has been sold around the world. You'd also have to come up with a good definition of culture. I'm using a very generous one here, including pop-culture, tech-culture and lots of what many people might consider trash. But yea, notwithstanding all of that, I still support the notion that US culture has been sold effectively throughout the world by the US and those who have tried to censor it.