It's a state secret. So my simple answer is: I don't know. We can only speculate.
Assuming that western sources are correct. That China currently has around 500 warheads, and it's been 4 years since China proclaimed that it intended to expand its nuke arsenal in 2020. Back in 2020, China apparently had 260 warheads. So maybe 240 warheads in 4 years, or about 60 warheads per year. Don't take these numbers seriously, because it's too simplistic, and Western sources on China have not been reliable.
What I am speculating is going on is that China's warhead production is increasing annually. They probably started out in 2020 from a slow walk, and are now on a slow jog. China had built a number of new breeder reactors, ostensibly for civilian purposes. Breeder reactors are not very economical for commercial power generation, but are excellent for producing fissile materials. Still, what we could see could be monitored by the IAEA. What we can't see, we don't know. So I do have a feeling that China's warhead production rate is most likely to be higher than what the Western analysts are projecting.
