Interesting question, I'll go back through and read all the answers with my afternoon tea.
I haven't a clue. I have been quilting since 1970, as a passion, not just once in awhile.
I don't make charity, quickie strip type quilts, or baby quilts. I used to make a lot of wall quilts as a way to learn a new technique. I haven't seen anything new in many years now
I do piece all my backs but I wouldn't even call them very simple.
I've worked full time all my life.
And I guess it all depends on what you call a quilt! Depending on how you look at it, a mug rug or postcard could be called a quilt.
So a lot of variables can go into that number.