Results from the latest quarterly streaming survey by HarrisX, shared exclusively with Variety Intelligence Platform, show that Netflix’s ad-supported tier is, as of the end of Q1, the second most common subscription plan for the service among U.S. households of the four tiers Netflix offers.

Out of more than 9,600 U.S. Netflix subscribers polled, 27% were on the “Standard with ads” plan, behind only the “Standard” plan — the cheapest ad-free tier currently on the domestic market — at 32%.

These results suggest adoption of the ad plan has accelerated significantly since it launched to muted results about a year and a half ago. It’s unclear how many users currently subscribe to the plan worldwide; Netflix has never revealed exact subscriber counts for the AVOD tier and has not disclosed any figures since announcing in January that it had surpassed 23 million global monthly active users.

But based on rough extrapolation from these survey results, around 22 million users may now exist in the domestic market alone. Netflix had about 82.7 million subscribers in the U.S. and Canada at the end of Q1, per its earnings report for the quarter; 27% of that figure is about 22 million.