Uber has joined the likes of Facebook and Google in releasing a transparency report, breaking down how it shares customers’ data with authorities.

The company seems uncomfortable with the amount of information it has been asked to share.

The inaugural report released Tuesday found the ride service had shared data on at least 13 million riders and drivers between July and December of last year — most of it at the request of U.S. transportation regulators such as the California Public Utilities Commission.

The data was shared in response to 33 regulatory requests, affecting 11.6 million passengers and 583,000 drivers; and 34 airport reporting requests, affecting 1.6 million passengers and 156,000 drivers.

"In many cases they send blanket requests without explaining why the information is needed, or how it will be used." — Uber, in a news release

In law enforcement investigations, Uber received 408 requests for rider accounts, and 205 for driver information. The company complied at least partly with those requests 84.8 per cent of the time.

The transparency report looked only at U.S. data. An Uber spokesperson said the company hopes to prepare transparency reports on Canada in the future, but has no concrete plans at the moment to do so.