It's not quite "more every week"; the numbers seem to be roughly stable since April. Of course it's still a lot.

One question that occurs to me is whether they can actually sustain this. Missiles aren't that cheap or fast to produce so it's possible that they're throwing out more than they can sustain in an attempt to wear down Ukraine at the last moment.

I'm not an expert on the weapon systems involved so maybe I'm way off base.