Apple has received more than four times as many national-security related requests from the U.S. government in the first half of this year versus a year ago.

According to a company report on Thursday, Apple had received between 13,250 and 13,499 national security requests affecting between 9,000 and 9,249 users. That compares with a range of 2,750 and 2,999 requests affecting between 2,000 and 2,249 users in the first half of 2016.

The requests come in the form of so-called National Security Letters, or NSLs, and requests under the Foreign Intelligence Surveillance Act, or FISA. Apple and other companies report ranges because government rules prevent disclosing precise numbers.

Microsoft and Facebook have yet to report any figures for 2017. Alphabet's Google said it had received between 0 and 499 National Security Letters requesting information on between 1,000 and 1,499 user accounts in the first half of 2017.