Source.
By drop-off, they mean the top two countries have over a billion people and the third country only has 330 million.
oh.... i thought they are suggesting that US somehow shrank from past moment when they had a billion. my bad.
Be respectful
By drop-off, they mean the top two countries have over a billion people and the third country only has 330 million.
oh.... i thought they are suggesting that US somehow shrank from past moment when they had a billion. my bad.