67 percent of all revenue generated by Google Play comes from outside the U.S. according to Chris Yerga, Google’s engineering director for Google Play.

Yerga shared the numbers as part of his presentation Android Apps in Google Play, during the I/O conference in San Francisco today, emphasizing how revenues have increased in countries like Japan and Korea. Google Play revenue in the two countries increased 14 times year-over-year, largely thanks to carrier billing. 73 percent of users in Japan and Korea pay for apps through carrier billing.

Google’s official numbers match what we’ve heard from independent developers like Robot Invader. In May Robot Invader CEO Chris Pruett told us his game Wind-Up Knight makes 60 percent of its revenue through Google Play, and Android users have higher conversion rates and ARPU. Pruett credits his app’s success on Google Play to access to carrier billing. In today’s I/O keynote Google announced it will expand direct billing to more than a dozen carriers.

In-app billing has also been a success for certain developers, said Yerga. He shared a slide with a testimonial from TinyCo, which reports its average revenue per paying user (ARPU) is higher in Google Play than any other app store.