Question: In what year was the town where the Howard Centre is located founded as a garden city?

Context paragraphs:
Garden City Golf Club: The Garden City Golf Club is a private golf course in Garden City, New York.  The club was founded in 1899, and is also known as the "Garden City Men's Club" or simply the "Men's Club" to distinguish it from the Garden City Country Club, and Cherry Valley Club, all of which are located in Garden City, NY.  It remains one of the few men-only golf clubs in the United States.

Garden City, South Carolina: Garden City, sometimes known as Garden City Beach, is a census-designated place (CDP) in Horry County, South Carolina, United States.  While Garden City is sometimes considered to be a city it is not incorporated and does not yet have a city council or mayor.  The population was 9,357 at the 2000 census and the 2010 population estimate is around 11,014.  Garden City Beach is located directly south of Surfside Beach and ends on a peninsula at the mouth of Murrells Inlet.

Garden City (Booragoon): Garden City Shopping Centre (usually known as Garden City, or Garbo) is a major regional shopping centre in the city of Perth, Western Australia.  Garden City is located at the corner of Marmion Street and Riseley Street in the southern suburb of Booragoon.  Garden City is majority-owned by AMP Limited through its Australian Core Property Portfolio.

Garden City station (Kansas): Garden City is a train station in Garden City, Kansas, United States.  It is served by Amtrak's "Southwest Chief" line.  It is located in downtown Garden City along the BNSF Railway La Junta Subdivision.  Garden City Station was originally built in 1907 by the Atchison, Topeka and Santa Fe Railroad and upon the restoration of 2002, was declared a historic landmark by the Finney County Preservation Alliance.

Howard Centre: The Howard Centre is a shopping centre in Welwyn Garden City.  It is named after Sir Ebenezer Howard, founder of the garden city movement.

Ebenezer Howard: Sir Ebenezer Howard {'1': ", '2': ", '3': ", '4': "} ( ; 29 January 1850 – 1 May 1928), the English founder of the garden city movement, is known for his publication "" (1898), the description of a utopian city in which people live harmoniously together with nature.  The publication resulted in the founding of the garden city movement, and the building of the First Garden City, Letchworth Garden City, commenced in 1903.

Garden City High School (Kansas): Garden City High School (known locally as GCHS) is a fully accredited high school, serving students in grades 9–12, located in Garden City, Kansas, USA.  Garden City High School (GCHS), a part of Garden City Public Schools, is the only high school within the city limits of Garden City, KS.  The school colors are brown and white, although gold is generally considered a third unofficial color.  Approximately 2,111 students are enrolled for the 2016-2017 school year.  The current principal is Steve Nordby.

Welwyn Garden City: Welwyn Garden City is a town in Hertfordshire, England.  It is located approximately 20 mi from Kings Cross, London.  Welwyn Garden City was the second garden city in England (founded 1920) and one of the first new towns (designated 1948).

Garden City Football Field: The Garden City Football Field, (formerly known as Metropolitan Field) is a stadium in Garden City, Michigan.  It is usually used for Garden City High School Football, Garden City's little league football team, Varsity and JV Track and Garden City High School Soccer.  All of the teams are nicknamed the Cougars.  The stadium is also the home of the Cambridge High School Panthers flag football team.  It has no official capacity but has hosted events drawing over 3,000 fans.  The stadium is located next to the parking lot for Cambridge High School.

Charles Purdom: Charles Benjamin Purdom, usually credited as C. B. Purdom (15 Oct 1883 – 8 July 1965), was a British author, drama critic, town planner, and economist.  He was one of the pioneers and founders of the first garden cities, Letchworth and Welwyn Garden City, the latter of which he was appointed Finance Director between 1919–1928.  He was then made Honorary Secretary, then Treasurer of the International Federation for Housing and Planning (1931–1935).  He was also founder of the Letchworth and Welwyn Garden City Theatre Society, now the Welwyn Drama Club.  He won the Howard Walden cup at the Welwyn Garden City Drama Festival and the David Belasco cup in New-York in 1927.  He was an author of many books on city development, on Shakespeare and Bernard Shaw plays, Harley Granville-Barker, and on producing plays.  He was editor of an English literary periodical called "Everyman", covering books, drama, music and travel and featured articles by renowned authors such as Ivor Brown, Arthur Machen, G. K. Chesterton, A. E. Coppard, and Bertrand Russell.  He was General Secretary of British Equity (1939–1940) and joint secretary of the London Theatre Council.  He was also the earliest biographer of Meher Baba.  He was father of the actor Edmund Purdom.  He died in Welwyn Garden City in 1965.

Supporting paragraphs: Howard Centre Welwyn Garden City
Answer: 1920