According to official sources, internet penetration in Vietnam was at 31% by the end of 2010. Internet penetration in Vietnam is similar to countries like China, Philippines and Thailand. Vietnam has seen a more rapid growth of the internet over the last few years than most other countries in the region and is one of the fastest growing internet countries in the world. In urban Vietnam (12 cities included in the Vietnam NetCitizens Study 2011), more than 50% of the population have used the internet already. Hanoi has the highest internet penetration in Vietnam. Internet usage is mainly concentrated in higher economic classes. Whilst 70% of economic class A citizens use the internet, internet penetration is only about 20% for economic class D and E