In July 2014, Amazon added the Kindle Unlimited subscription service that initially offered unlimited access to over 638,000 titles and over 7,000 audiobooks for a $9.99 monthly fee.[12][13] As of June 2015, there were over one million titles available in Kindle Unlimited,[14] from publishers such as Houghton Mifflin Harcourt, Lonely Planet, Simon & Schuster, Wizarding World Digital, and Workman Publishing Company.[15] As of February 2017, the U.S. version of Kindle Unlimited includes over 1.5 million titles includes over 290,000 foreign language titles.[16] Amazon pays authors by using a per-page rate and during 2016 nearly $200 million was paid to authors. In 2019, Amazon paid over $300 million to authors and publishers that provide content to Kindle Unlimited.[17]