Apart from increased supply of slaves, the demand also increased due to the asiento trading with the Spanish. Between 1660 and 1690, the Dutch trading posts in Africa, which included the Slave Coast, Arguin, and Senegambia, shipped a third of the total number of slaves across the Atlantic. On the Gold Coast, Governor De la Palma actively tried to systemize the slave trade and improve the numbers of slave shipped to the Americas. To this purpose, he sent Jacob van den Broucke as "opperkommies" (head merchant) to the Dutch trading post at Ouidah, on the Slave Coast.