By the end of 2011, the world held a total of 3.72 million data centers, and more than half of them were located in US and Europe. On the whole, the Central and Eastern Europe, part of Asia-Pacific, North America and West Europe ranked high, but their room for further increase is limited, with a compound annual growth rate of 3.8% during the past three years. By contrast, emerging markets such as Asia-Pacific and Africa that have seen a compound growth rate as high as 14.2% will be the biggest drive for the growth of the whole industry.