http://www.techradar.com/news/the-rise-of-the-smart-speaker-now-owned-by-one-in-six-americans

Smart speakers are big business, with about 39 million Americans now owning one according to a recent poll undertaken by US radio syndicator NPR and Edison research.

That roughly translates as 16% of all Americans, one in six. That’s a 128% increase in the numbers from January 2017.