Given the task definition, example input & output, solve the new input case.
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
Example: Passage: The French and Indian War (1754–1763) was the North American theater of the worldwide Seven Years' War. The war was fought between the colonies of British America and New France, with both sides supported by military units from their parent countries of Great Britain and France, as well as Native American allies. At the start of the war, the French North American colonies had a population of roughly 60,000 European settlers, compared with 2 million in the British North American colonies. The outnumbered French particularly depended on the Indians. Long in conflict, the metropole nations declared war on each other in 1756, escalating the war from a regional affair into an intercontinental conflict.
Output: When was the French and Indian War?
This question is based on the following sentence in the passage- The French and Indian War (1754–1763) was the North American theater of the worldwide Seven Years' War. It is a common convention to write (start year-end year) beside a historical event to understand when the event happened. You can ask questions like this one about dates, years, other numerals, persons, locations, noun phrases, verb phrases, adjectives, clauses etc. which exist in the paragraph.

New input case for you: Brazilian census data (PNAD, 1999) indicate that 2.55 million 10-14 year-olds were illegally holding jobs. They were joined by 3.7 million 15-17 year-olds and about 375,000 5-9 year-olds. Due to the raised age restriction of 14, at least half of the recorded young workers had been employed illegally which lead to many not being protect by important labour laws. Although substantial time has passed since the time of regulated child labour, there is still a large number of children working illegally in Brazil. Many children are used by drug cartels to sell and carry drugs, guns, and other illegal substances because of their perception of innocence. This type of work that youth are taking part in is very dangerous due to the physical and psychological implications that come with these jobs. Yet despite the hazards that come with working with drug dealers, there has been an increase in this area of employment throughout the country.
Output:
In 1999 how many children were working illegally in Brazil?