source:

https://saidit.net/s/runebooks/comments/4v34/christian_slaves_muslim_masters_white_slavery_in/

In his 2003 book Christian Slaves, Muslim Masters: White Slavery in the Mediterranean, the Barbary Coast and Italy, 1500–1800, Ohio State University history professor Robert Davis states that most modern historians minimize the white slave trade.

Davis estimates that slave traders from Tunis, Algiers, and Tripoli alone enslaved 1 million to 1.25 million Europeans in North Africa, from the beginning of the 16th century to the middle of the 18th (these numbers do not include the European people who were enslaved by Morocco and by other raiders and traders of the Mediterranean Sea coast).[3] Roughly 700 Americans were held captive in this region as slaves between 1785 and 1815.[4] However, to extrapolate his numbers, Davis assumes the number of European slaves captured by Barbary pirates remained roughly constant for a 250-year period, stating:

"There are no records of how many men, women and children were enslaved, but it is possible to calculate roughly the number of fresh captives that would have been needed to keep populations steady and replace those slaves who died, escaped, were ransomed, or converted to Islam. On this basis it is thought that around 8,500 new slaves were needed annually to replenish numbers - about 850,000 captives over the century from 1580 to 1680. By extension, for the 250 years between 1530 and 1780, the figure could easily have been as high as 1,250,000.[5]"

https://en.wikipedia.org/wiki/Barbary_slave_trade

TL:DR; About 600,000 black slaves were transported to America, or 5% of the 12 million slaves taken from Africa, which is 12 times less than the White Europeans which were abducted and enslaved from Europe.