In January of 2019, the PLA has 1000 Type 96, 1500 Type 96A, 600 Type 99, 250 Type 99A, and 100 Type 15 in its active service.
Considering the Type 99A has been in production since 2007, not a lot of it has been built.
However, the Type 96A, which entered production one year earlier than the Type 99A is significantly greater in number.
Considering how much of the resources have diverged to PLAN and PLAAF, I don't think the production of Type 99As would ram up any time soon.
The data are estimations from "The military balance 2019", but I think it's accurate enough.