By the first half of the 2010s, the Chinese market had become the largest contributor to Proton's export revenues. Although Proton cars sold in China carried different names and badges under the local Youngman EuropeStar brand, Proton nonetheless received royalties for the use of their platforms and Campro engines. Proton's six-year contract with Youngman expired in 2012, but the Zhejiang-based company continued to unofficially produce Proton's cars and engines up until early 2015. In February 2015, Proton announced that they would revive their joint venture with Fujian-based Goldstar, and would not renew their contract with Youngman.