The correlation, whatever one can see in this poll, will only represent the members of this forum, and out of these, only those willing to cast a vote.
The results of the poll about "Where do you come from", ie where do you live now, show a huge discrepancy between the proportion of where people come from on this forum and where all the people come from who walk a Camino.
I've no experience of my own to share, I didn't even meet many camino walkers who were on an organised tour, and if I did, it wasn't something I recorded in any notes or gave prime space in my internal memory banks because frankly, despite the rants on here and the anecdotes, camino walkers who had booked with a tour agency, especially if it was on what is called a self-guided tour, are not particularly discernible when you pass them or chat with them on the way or at a rest place. And I'm glad that this thread is back on course! Don't turn this into rants and justifications.
My money would be on "Western Europe", btw, in this case mainly France, Germany, UK, Ireland and so on. It's the largest "feeder area", apart from Spain obviously, and it is where I noticed a remarkable increase in the offer of walking tours on the Caminos, whether self-guided or guided, during the last decade or so.