I have no metrics on this, but I've been seeing/hearing of scrum popping up in all sorts of places, not just in software but in other firms where it doesn't belong. For example, my relative works in a chemical engineering firm and they use scrum. A friend of mine is in another flavor of engineering field and they use scrum as well. The sad truth is agile/scrum has really lost the plot in most places and is mostly used as a way to justify micromanagement of developers (or other roles) and lack of proper long term planning.