Because of the rapid growth in population in China in the last quarter of the 20th century they introduced the One Child Policy so that the growth rate would slow and curb problems arising from the baby boom such as overpopulation and an ageing population in the future.
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 current population of Japan, as of 2014, is 126 million people. The current population of China is 1.36 billion people.
One example of anti-natalist policies implemented by a government to control population growth is China's one-child policy, which restricted most couples to having only one child in order to curb population growth.
The population of China Steel is 9,071.
China Steel's population is 2,006.
The population of China Telecom is 2,010.
China Telecom's population is 312,520.
The population of China Post is 860,200.
China Mobile's population is 145,954.