Translation:How many workers work in your country?
Looking at it purely from English:
This question appears, to me, to be about unemployment levels.
"How many people work" is different from "How many workers work", as seen in government unemployment stats. "People" includes those outside the labor market due to being under-aged, in school, retired, medical disability, etc. "Workers" only includes the people who could reasonably be looking for work. (For example, Adam is twenty-five, in good health, and not attending school; he would be considered a "worker" even though he was laid off his job last month. Sophia is twenty-five, in good heath, and enrolled in college; she would not be considered a worker, even though she could go out and acquire a job tomorrow.)