Simply because, China is the most populated country in the world, and the Chinese Gov't came up with a rule, called the "one Child policy". If a Chinese couple chose to have more than one child, they'll be taxed so heavily by the Chinese gov't which will lead the couple to poverty
China and India have implemented population control measures in the past, such as the one-child policy in China. Other countries may have voluntary family planning programs to help manage population growth, but not explicit population control measures.
To ensure the human population continues to grow sustainably, we need to manage resources, control birth rates, and address environmental impacts.
The population of China was 1.14333 billion in 1990. (Unofficial statistics, for your reference only)
== == The population of China is 1.3 Billion.
China has the biggest population because the population in china is 1,320,000,000.
The population of China Post is 860,200.
China Mobile's population is 145,954.
China Mobile's population is 2,009.
The population of Bank of China is 2,010.
Bank of China's population is 389,827.
China Minmetals's population is 146,000.
The population of China Nepstar is 14,793.