Appears that it depended on how long a particular model (body type carpet set) and color lasted in inventory as they used up what was in the system, supplier and plant inventory so difficult to know exactly - plus the fact we don't know when examples were actually built
Allot of carpet was replaced after only a decade or two so chasing down examples is difficult so if you can get access to the car sometime you have to rely on other findings to help determine which style of carpet was originally installed.
Guess the question is - What color was your carpet originally to see what I have in my records?
A picture to illustrate the style carpet and trim we're discussing here