| Atlantic trade volume |
Middle Passage mortality rate |
Islamic Trade | |
| 16c | ~3k/yr (rising from 500 to 6K) |
~50% | ~10k/yr |
| 17c | ~20k/yr (rising from 14K to 25K) |
~10k/yr | |
| 18c | ~65k/yr (rising from 40K to 80K) |
~10k/yr | |
| 19c | ~70k/yr (through 1856) |
~5% | ~10k/yr |
| total | 12M-14M | ~25% | ~5M |
Sources include Bentley&Ziegler, Traditions and Transformations, McKay, et. al, and others
For a more detailed timeline, see the Slave Voyages website and this map
From Stearns, et al. World Civilizations: The Global Experience, 6e, Table 25.1 (corrected)
| in thousands | 1500s | 1600s | 1700s | 1800s | total |
| Red Sea | 200 (17) | 200 (7) | 200 (3) | 450 (8) | 1050 (6) |
| Trans-Sahara | 550 (47) | 700 (24) | 700 (9) | 1200 (22) | 3150 (19) |
| East Africa / Indian Ocean | 100 (9) | 100 (4) | 400 (5) | 442 (8) | 1042 (6) |
| Trans-Atlantic | 325 (28) | 1868 (65) | 6133 (83) | 3330 (61) | 11656 (69) |
| Total | 1175 (7) | 2868 (17) | 7433 (44) | 5422 (32) | 16898 |