Pandora now has more than 150 million registered users, the company announced on Tuesday.

Even as the online radio company faces increased competition from music streaming services like Rdio and Spotify, its numbers of both registered and active users have increased 50% since the beginning of the 2012 financial year.

About 52 million users are active, and together they streamed 1.06 billion hours of music last month — an 87% increase over this time last year.

Much of this growth can be attributed to mobile use, Pandora President and CEO Joe Kennedy said while speaking onstage at the International CTIA Wireless conference Tuesday.

Pandora users listened to 70% of the music they streamed from Pandrora in April on mobile devices, he said. Two-thirds of registered users have visited the site on a mobile device.

Increased mobile use of Pandora has not, however, made it profitable. The company reported a 99% year-over-year increase in revenue and a $16-million loss for fiscal year 2012. –Mashable