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India boasts a current population of 1.2 billion with one in every six person in the world being Indian.
The average population density is 382 people per square kilometre, 2.5 times of that of China.
In metropolitan cities such as the capital, New Delhi, the population density reaches more than 11 thousand person per square kilometer.
The new United Nations (UN) report said that by the end of the 21st century, Nigeria could potentially displace China as the second most populous country.
According to the UN, the current global population is 7.2 billion which is expected to reach 9.6 billion in 2050, with a faster growth rate in developing countries and Africa.