The results so far have been shared with select clients, but Nielsen’s chief executive officer Mitch Barns has said that the company will begin offering data on viewing by Netflix and Amazon Prime subscribers starting in the middle of this year.

“That will be the last significant portion of overall television content viewing that we don’t already measure,” Barns said in an interview with Bloomberg. “We really will have a full set of capabilities in the market to measure what we call the total audience across all screens, devices and platforms.”

The technology does not work for original Netflix programmes such as House of Cards.