While we don't know, but I would not be surprised if the production of missiles like the PL-15 could reach around the ~1000 a month at max throughput (three 8 hour shifts a day).
While regular output (1 shift likely not even running at 100%) would likely be less than 1/3 of the 1000.
That said, the PL-15 might have stopped, but the new PL-16 or whatever its successor is, can probably do the same.
Or in short, whatever current non wartime production, for China atleast, ramping it up to probably 3x or way more in a short time frame (a month maybe) should not be hard.
Again, PL-15 production of 1000 per month sounds way too high.
After 1 year, that is 12K
After 5 years, that is 60K
After 10 years, that is 120K
1. There aren't enough aircraft capable of using all these PL-15
2. There aren't enough opposing air targets for even 60K PL-15s.
My "guess" would be that PL-15 production has historically been somewhere between 1200-2000 per year.
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But going forward, we've seen a significant increase in terms of fighter production in the past 2 years, which hasn't yet topped out.
So AAM production (presumably of the PL-16) should be higher.
And if the PL-16 is a smaller form factor, optimised for internal carriage by stealth fighters, you would want stealth fighters to predominantly use the PL-16 instead of the existing stockpiles of PL-15.
Depending on the assumptions, my guess is it will be between 1800-3000 per year