By December 2009, the US had 286 million mobile subscribers covering 91 percent of the population. Other nations have been adding mobile devices at an even faster pace. The world contained some 4.6 billion active mobile phones at the start of 2010. As of June 2010, China had 775 million mobile subscribers covering 58 percent of the population. China's overall wireless subscribership was growing at a rate of 15.4 percent per year in the third quarter of 2009. The overall Asian Pacific region houses 39 percent of the broadband market and supports 42 percent of all Internet users. This region also has the largest number of cell phone users in the world. Furthermore, it's rumored that over 50 billion mobile devices will be in use worldwide in 2020.