| reach 7 billion | 0.68 |
| reach 9.2 billion | 0.60 |
| reach 8.6 billion | 0.53 |
| surpass 11.2 billion | 0.47 |
| reach 6 billion | 0.38 |
| dropped to about 1950 l… | 0.34 |
| follow hyperbolic patte… | 0.32 |
| become infinite | 0.32 |
| stop growing after a sa… | 0.32 |
| grown to a billion indi… | 0.25 |
| More » |
| 300 million | 0.25 |