China's population of Internet users, already the world's second-biggest after the U.S., has jumped by nearly 20 percent over the past year to 123 million, with broadband access soaring, it was announced Wednesday.

The United States has some 204 million Internet users.

The number of Web sites in China rose by more than 110,000 to a total of 788,400, the China Internet Network Information Center said in an annual survey.

China encourages Internet use for business and education and has invested heavily in broadband service, but materials considered pornographic or subversive are not allowed.

The number of Internet users in China with broadband service jumped by 45 percent over the past year to 77 million, or about two-thirds of the total online population, the Internet agency said.

The average Chinese Internet user now spends 16.5 hours per week online, a new record high, the agency said.