Question: What is the average household income in the country with the museum prominently located in Trafalgar Square?

full_context: Document 1: Household income in the United States: Another common measurement of personal income is the mean household income. Unlike the median household income, which divides all households in two halves, the mean income is the average income earned by American households. In the case of mean income, the income of all households is divided by the number of all households. The mean income is usually more affected by the relatively unequal distribution of income which tilts towards the top. As a result, the mean tends to be higher than the median income, with the top earning households boosting it. Overall, the mean household income in the United States, according to the US Census Bureau 2014 Annual Social and Economic Supplement, was $72,641.
Document 2: Wayback Machine: In 1996 Brewster Kahle, with Bruce Gilliat, developed software to crawl and download all publicly accessible World Wide Web pages, the Gopher hierarchy, the Netnews (Usenet) bulletin board system, and downloadable software. The information collected by these "crawlers" does not include all the information available on the Internet, since much of the data is restricted by the publisher or stored in databases that are not accessible. These "crawlers" also respect the robots exclusion standard for websites whose owners opt for them not to appear in search results or be cached. To overcome inconsistencies in partially cached web sites, Archive-It.org was developed in 2005 by the Internet Archive as a means of allowing institutions and content creators to voluntarily harvest and preserve collections of digital content, and create digital archives.
Document 3: Saint Helena: Household survey results suggest the percentage of households spending less than £20 per week on a per capita basis fell from 27% to 8% between 2000 and 2004, implying a decline in income poverty. Nevertheless, 22% of the population claimed social security benefit in 2006/7, most of them aged over 60, a sector that represents 20% of the population.
Document 4: Household income in the United States: One key measure is the real median level, meaning half of households have income above that level and half below, adjusted for inflation. According to the Census, this measure was $59,039 in 2016, a record high. This was the largest two year increase percentage increase on record.
Document 5: New Delhi: New Delhi is home to several historic sites and museums. The National Museum which began with an exhibition of Indian art and artefacts at the Royal Academy in London in the winter of 1947–48 was later at the end was shown at the Rashtrapati Bhawan in 1949. Later it was to form a permanent National Museum. On 15 August 1949, the National Museum was formally inaugurated and currently has 200,000 works of art, both of Indian and foreign origin, covering over 5,000 years.
Document 6: Household income in the United States: One key measure is the real median level, meaning half of households have income above that level and half below, adjusted for inflation. According to the Census, this measure was $59,039 in 2016, a record high. This was the largest two year percentage increase on record.
Document 7: Royal Institute of British Architects: In 2004, the two institutions created the Architecture Gallery (Room 128) at the V&A showing artefacts from the collections of both institutions, this was the first permanent gallery devoted to architecture in the UK. The adjacent Architecture Exhibition Space (Room 128a) is used for temporary displays related to architecture. Both spaces were designed by Gareth Hoskins Architects. At the same time the RIBA Library Drawing and Archives Collections moved from 21 Portman Place to new facilities in the Henry Cole Wing at the V&A. Under the Partnership new study rooms were opened where members of the public could view items from the RIBA and V&A architectural collections under the supervision of curatorial staff. These and the nearby education room were designed by Wright & Wright Architects.
Document 8: England: English Heritage is a governmental body with a broad remit of managing the historic sites, artefacts and environments of England. It is currently sponsored by the Department for Culture, Media and Sport. The charity National Trust for Places of Historic Interest or Natural Beauty holds a contrasting role. 17 of the 25 United Kingdom UNESCO World Heritage Sites fall within England. Some of the best-known of these are: Hadrian's Wall, Stonehenge, Avebury and Associated Sites, Tower of London, Jurassic Coast, Saltaire, Ironbridge Gorge, Studley Royal Park and various others.There are many museums in England, but perhaps the most notable is London's British Museum. Its collection of more than seven million objects is one of the largest and most comprehensive in the world, sourced from every continent, illustrating and documenting the story of human culture from its beginning to the present. The British Library in London is the national library and is one of the world's largest research libraries, holding over 150 million items in all known languages and formats; including around 25 million books. The most senior art gallery is the National Gallery in Trafalgar Square, which houses a collection of over 2,300 paintings dating from the mid-13th century to 1900. The Tate galleries house the national collections of British and international modern art; they also host the famously controversial Turner Prize.
Document 9: London: London is home to many museums, galleries, and other institutions, many of which are free of admission charges and are major tourist attractions as well as playing a research role. The first of these to be established was the British Museum in Bloomsbury, in 1753. Originally containing antiquities, natural history specimens and the national library, the museum now has 7 million artefacts from around the globe. In 1824 the National Gallery was founded to house the British national collection of Western paintings; this now occupies a prominent position in Trafalgar Square.
Document 10: Micro gallery: A micro gallery was a computer-based guide to archives and museum collections, first developed for the collections at the National Gallery in London, UK It took three years to develop by the company Cognitive Applications, and opened in July 1991 as part of the facilities in the Sainsbury Wing. Visitors could use the system to determine which pictures they would like to see in the gallery. It was possible to print out personalised information for use during the visit. The Micro Gallery ran for 14 years and a CD-ROM with similar facilities was produced.
Document 11: London: London contains four World Heritage Sites: the Tower of London; Kew Gardens; the site comprising the Palace of Westminster, Westminster Abbey, and St Margaret's Church; and the historic settlement of Greenwich (in which the Royal Observatory, Greenwich marks the Prime Meridian, 0° longitude, and GMT). Other famous landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Paul's Cathedral, Tower Bridge, Trafalgar Square, and The Shard. London is home to numerous museums, galleries, libraries, sporting events and other cultural institutions, including the British Museum, National Gallery, Tate Modern, British Library and 40 West End theatres. The London Underground is the oldest underground railway network in the world.
Document 12: Income in the United Kingdom: The most recent SPI report (2012 / 13) gave annual median income as £21,000 before tax and £18,700 after tax. The 2013 / 14 HBAI report gave median household income (2 adults) as £23,556. The provisional results from the April 2014 ASHE report gives median gross annual earnings of £22,044 for all employees and £27,195 for full - time employees.
Document 13: Kathmandu: The Srijana Contemporary Art Gallery, located inside the Bhrikutimandap Exhibition grounds, hosts the work of contemporary painters and sculptors, and regularly organizes exhibitions. It also runs morning and evening classes in the schools of art. Also of note is the Moti Azima Gallery, located in a three storied building in Bhimsenthan which contains an impressive collection of traditional utensils and handmade dolls and items typical of a medieval Newar house, giving an important insight into Nepali history. The J Art Gallery is also located in Kathmandu, near the Royal Palace in Durbarmarg, Kathmandu and displays the artwork of eminent, established Nepali painters. The Nepal Art Council Gallery, located in the Babar Mahal, on the way to Tribhuvan International Airport contains artwork of both national and international artists and extensive halls regularly used for art exhibitions.
Document 14: ComputerTown UK: In the November 1980 issue of the UK's Personal Computer World (PCW magazine], there was an article written by David Tebbutt, about his visit to the Menlo Park Library where the "ComputerTown USA!" a self-help computer literacy movement, started by the People's Computer Company, was based. That article and the regular CTUK column/page in future issues of PCW in turn sparked a widespread UK based self-help computer literacy movement, called "ComputerTown UK!". Within a few months over 20 local groups sprang up.
Document 15: Collection of the National Gallery, London: The National Gallery is the primary British national public art gallery, sited on Trafalgar Square, in central London. It is home to one of the world's greatest collections of Western European paintings. Founded in 1824, from an initial purchase of 36 paintings by the British Government, its collections have since grown to about 2,300 paintings by roughly 750 artists dating from the mid-13th century to 1900, most of which are on display. This page lists some of the highlights of the collection.
ground_truth: £23,556
sub_queries: Which London museum is prominently located in Trafalgar Square? Answer: the National Gallery
the National Gallery >> country Answer: UK
what is the average household income in the UK 2017 Answer: £23,556