At a guess, my residential marketplace seems to be about 70% wool or woll blend, perhaps 25% polypropylene, with only the occasional nylon or polyester. Veggy carpets are a rarity.
This topic started me thinking about the fibres I clean, and what really surprised me was the small amount of nylon that I clean. However, in the office environment, I'd take a guess at 90% nylon. Indian/chinese Restaurants about 110% woven polyprop (the chinese can't get their tongues around the word "Belgian"
) The small amount of Licensed trade I do is 100% woven wool.
Safe and happy cleaning
Ken