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As of July 2010, China's population grew to an estimated 1.33 billion, making it the most populated country in the world. China's ever-growing population prompted its government to implement the controversial "one-child" policy in 1979, which imposes a heavy fine to couples if they have a supernumerary child without a permit. Those who follow the law receive rewards and benefits. With no policy overturn in sight, as of 2010, Chinese couples continue to take birth control methods available to them.