The United States called on the California-based Internet company to disclose data from12,533 user accounts compared with the 4,759 accounts targeted by second-place Taiwan, according to the report.
"Data was only provided in a fraction of the cases," Yahoo said.
"We've worked hard over the years to earn our users' trust and we fight hard to preserve it," Yahoo's Chief Executive Marissa Mayer said in an introduction to the report.
The transparency report included requests made with National Security Letters cloaked in secrecy, and which come with a six-month reporting delay imposed by the US government.
"On the international front, a number of countries seek to expand their surveillance authorities beyond their borders," Yahoo General Counsel Ron Bell said in the report.
Bell maintained that US Department of Justice's efforts to improve a Mutual Legal Assistance Treaty could help counter the "worrisome trend."
"We will continue our efforts to protect your information from unclear, improper, over-broad or unlawful government requests," Bell said.
According to Yahoo more than 800m people around the world visit Yahoo daily in online "habits" including sending email, sharing photos, and tracking news or sports.
Court documents disclosed earlier this month showed that US authorities threatened to fine Yahoo $250,000 a day if it failed to comply with a secret surveillance program requiring it to hand over user data in the name of national security.
"The documents, made public in a rare unsealing by a secretive court panel, underscore how we had to fight every step of the way to challenge the US government's surveillance efforts," Bell said in a blog post at the time.
The documents shed new light on the PRISM snooping program revealed in leaked files from former National Security Agency contractor Edward Snowden.
The program allowed US intelligence services to sweep up massive amounts of data from major Internet firms including Yahoo and Google. Officials have said the deeply contentious program ended in 2011.
Bell said the 1,500 pages of documents were ordered to be released by the Foreign Intelligence Surveillance Court in the case dating from 2007.
"We refused to comply with what we viewed as unconstitutional and over-broad surveillance and challenged the US government's authority," he said.
Yahoo's court challenge failed and it was forced to hand over the US user data.
"At one point, the US government threatened the imposition of $250,000 in fines per day if we refused to comply," Bell revealed.
Since the Snowden leaks, Yahoo and others have been seeking to make public court documents to prove they were forced to comply with government requests and made numerous attempts to fight these efforts, rather than simply acquiescing to them, as some critics say.
The court records, seen by AFP, showed Yahoo challenged the government on constitutional grounds, saying the surveillance program violated protections against unreasonable search and seizure.
"The US Supreme Court has never sanctioned warrantless surveillance of US citizens," Yahoo said in a legal brief.
Source: AFP via I-Net Bridge
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