Please answer a question about the following article about Plymouth:

Throughout the 17th century Plymouth had gradually lost its pre-eminence as a trading port. By the mid-17th century commodities manufactured elsewhere in England cost too much to transport to Plymouth and the city had no means of processing sugar or tobacco imports, although it did play a relatively small part in the Atlantic slave trade during the early 18th century.

In what century did Plymouth cease to be a vital trading port?
17th