Thanks both! That's fascinating.
So it does look as if it's been around, at a low level, since the mid 19th, though maybe coined earlier.
It really got going over here from about 1960 though, roughly doubling every decade since then. My prejudice is that that probably coincided with the advent of management-speak, but I can't really claim that it's a made-up word. I still don't like it though.
I'll try and remember those resouces, especially the Ngram one.