Analysis of information sources in references of the Wikipedia article "Liverpool" in Simple English language version.
In reality, though, the half dozen or so ships that somewhere like Chester or Poulton sent is insignificant compared with the dominant involvement of Liverpool (5300 voyages), London (3100 voyages) and Bristol (2200 voyages) which between them accounted for over 90% of the British trade. And the process of domination seems to have accelerated at the end of the century with Liverpool not only outstripping its English rivals but the European competition. In the two decades preceding abolition, Liverpool was responsible for 75% of all slaving voyages across Europe.
