Now the population is increasing by more than 90 million people a year, according to the Countrymeters service.
More than 70% of the world's population lives in the 20 most populous countries, with about 36% of the world's population living in China and India.
Even though China is currently the most populous country in the world, India's population is growing at a much faster rate. In 2023, India is expected to take its place in this ranking.
In addition to them, the top five most populous countries included the US, Indonesia and Pakistan.
More than half of the world's population identifies with a religious group. The largest groups are: Christianity (32%) and Islam (24%).