Increase of Slave Population.
| Years. | No. of Slaves. | Increase. | Per ct. of Increase. |
| 1790 | 697,897 | ||
| 1800 | 893,041 | 195,144 | 28 |
| 1810 | 1,191,364 | 298,323 | 32 |
| 1820 | 1,538,064 | 346,700 | 29 |
| 1830 | 2,009,031 | 470,967 | 29 |
| 1840 | 2,487,855 | 478,324 | 24 |
| 1850 | 3,204,313 | 716,958 | 29 |
| 1860 | 4,002,996 | 798,683 | 25 |
The average increase in every ten years during the seventy years has been about 28 per cent.