You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What was the population of Kowloon City, an area in Kowloon, Hong Kong, by 1990?" whose answer is 50,000 residents.
Each document should contain about 30 words, and these documents should contain useful information.

Query: population of Kowloon City in 1990
Useful Output:

Doc 1: Total population Sex ratio · Hong Kong · 7 413 070. Kowloon City · 410 634 · Kowloon City · 14 350. (Kowloon City) Junction Road - Kowloon City Section
Doc 2: (Kowloon City) Junction Road / Fuk Lo Tsun Road / Lion Rock Road 1990-2000's private residential buildings 37.6%. (Kowloon City) Junction Road - Kowloon City
Doc 3: In 1990, the Kowloon Walled City population of 50000 people lived within a property size of two football fields https://t.co/9Pou3ZRawN.
Doc 4:  Tak Ku Ling Road / Kai Tak Road / Sa Po Road 1970-1980's private residential buildings 1 875. (Kowloon City) 1990-2000's private residential buildings 2 349.
Doc 5: This settlement (2.6 ha / 6.4 acres / 0.026 sq. km) had 50 thousand residents in 1990. It puts its population density at incredibly 1.9 million inhabitants per