1995: population of developing countries = 58× 5/6 = 4.833 billion.

In 2000, the population of developing countries = 63× 5/6 = 5.25 billion.

In 2025, the population of developing countries = 85× 5/6 = 7.083 billion.

The population growth rate of developing countries in 2025 = (70.83-52.50)/52.50 = 34.91%.

Population growth rate of developing countries in 2050 =? What's the data about the population in 2050? )