Compared to the population in each country. Found to vary somewhat. Which we can distinguish the rate of population growth is 2 groups according to the country's development .
When comparing the addition of population in each country. I found that different? Which we can distinguish the population increase rate has been a big group 2 according to the country's development environment .
When comparing the increase of the population in each country, and then found that vary with some which we can separate the difference of the population growth has a large group of 2 to the development of the country