I am ignorant, what is the data here? Which animal-to-human outbreaks are we counting?
The top animal-derived epidemics I can think of would be: SARS and 2019-nCoV from china, H1N1 had mixed heritage, MERS seemed to come from the middle east, Ebola and HIV from africa. So, pretty spread out?
Also, China is substantially larger than everything else but India, so wouldn't this be an expected outcome anyway?