Does work experience in non-related field help in grad school admissions?
It might have been useful to state the country you are inquiring about as this may be different all over the world.

However, in my experience, the people who oversee the admission process are not at all related to the people who create the statistics. They admit you because they believe you could handle the program - not because of some job prospects. Relevant job experience could be one factor which makes it more likely that you succeed (or not).

Indeed, most professors I know see their programms not as a way to obtain a (non-academic) job, but rather as a way to spread deep academic knowledge.  (I don't disagree with this view.) I don't see how a good academic program would by itself mean a job guarantee.

Edit: I just saw that you write "non-related" field in the title. Again, there is no yes/no answer to this question. Some professors might see this experience as positive since it might show that you have certain skills, others may see that you are not loyal enough to their field..