Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: The arrival of the Manchester Ship Canal in 1894, and the subsequent development of the Trafford Park industrial estate in the north of the town – the first planned industrial estate in the world – had a substantial effect on Stretford's growth. The population in 1891 was 21,751, but by 1901 it had increased by 40% to 30,436 as people were drawn to the town by the promise of work in the new industries at Trafford Park.During the Second World War Trafford Park was largely turned over to the production of matériel, including the Avro Manchester heavy bomber, and the Rolls-Royce Merlin engines used to power both the Spitfire and the Lancaster. That resulted in Stretford being the target for heavy bombing, particularly during the Manchester Blitz of 1940. On the nights of 22/23 and 23/24 December 1940 alone, 124 incendiaries and 120 high-explosive bombs fell on the town, killing 73 people and injuring many more. Among the buildings damaged or destroyed during the war were Manchester United's Old Trafford football ground, All Saints' Church, St Hilda's Church, and the children's library in King Street. Smoke generators were set up in the north of the town close to Trafford Park in an effort to hide it from enemy aircraft, and 11,900 children were evacuated to safer areas in Lancashire, Cheshire, Derbyshire, and Staffordshire, along with their teachers and supervisors. A memorial to those residents who lost their lives in the bombing was erected in Stretford Cemetery in 1948, over the communal grave of the 17 unidentified people who were killed in the blitz of December 1940.Between 1972 and 1975, what is now a closed B&Q store in Great Stone Road was the 3,000-capacity Hardrock Theatre and Village Discothèque, hosting some of that period's major artists in their prime. Led Zeppelin, David Bowie, Bob Marley, Elton John, Hawkwind, Yes, Chaka Khan, Curved Air and Lou Reed were amongst those who appeared. Tangerine Dream was the last band to perform at the Hardrock, on 19 October 1975. In more recent years, Lancashire Cricket Club's Old Trafford ground, next door, has provided a concert venue for bands such as Oasis, Foo Fighters, The Cure, Radiohead, Coldplay, Arctic Monkeys and Pixies.
A:
The population of what had increased by 40% in 1901?