Using information from the wiki, i have compiled a list of the yields from trading with the foreign ports with a fleet at level 1, 6 and 12 (pages at the bottom left of the document).
the total amout is an estimate of value in rings of the trade goods. this was derived from taking the production of a business (180R) and dividing the production of the other resources to yield an estimated ring value per good. THIS IS ONLY AN ESTIMATE! ACTUAL VALUE OF GOODS MUST BE DETERMINED IN THE FIELD!
This does not take into effect the most recent Winds of fortune.
Thoughts, questions, suggestions?