British colonial trade in India

I’m doing research for a board game that I’m planning on entering in a competition.

In relation to each other I need to know the relative value of:

-Opium
-Cotton
-Spices (pepper, cinnamon, etc.)
-Indigo dyestuffs
-Tea

In short, how would you order them.

Information on the trade value of these goods at this time period is incredibly scarce and even when I can find it, it’s simply the total made which doesn’t really help me determine value.

I was hoping someone out there would have some background on this topic giving them more insight than I have.