Question: What is the population of the country that hosted the 1920 Summer Olympics in which competed the home country of the singer of Je vais me marier, Marie

full_context: Document 1: Patrick Moutal: Patrick Moutal is a French sitarist and musicologist. He has been teaching north Indian classical music at the Paris Conservatoire (CNSMDP) since 1984 (Jazz & Improvised Musics and Pedagogy dpts).
Document 2: Sweden at the 1920 Summer Olympics: Sweden competed at the 1920 Summer Olympics in Antwerp, Belgium. 260 competitors, 247 men and 13 women, took part in 100 events in 18 sports.
Document 3: Henri Christiné: The son of a French Savoyard watchmaker, Christiné was born in Geneva, Switzerland. He began by teaching at the lycée in Geneva, while pursuing his interest in music and playing organ in a local church. He married a cafe singer whose troupe was passing through Geneva, and went with her to Nice where they were married. He made his home in France, writing songs firstly for his wife and then for popular singers such as Mayol, Dranem, and Fragson. He also conducted for the music hall at the Place Clichy.
Document 4: Un banc, un arbre, une rue: "Un banc, un arbre, une rue" ("A Bench, a Tree, a Street") was the winning song of the Eurovision Song Contest 1971 performed in French by French singer Séverine, representing Monaco.
Document 5: Patrick Juvet: Patrick Juvet (born 21 August 1950, in Montreux, Switzerland) is a former model turned singer-songwriter, who had a string of hit records in France. While his early career was focused on making pop records, he found international success as a disco music performer in the latter half of the 1970s.
Document 6: Switzerland at the 1920 Summer Olympics: Switzerland competed at the 1920 Summer Olympics in Antwerp, Belgium. 77 competitors, all men, took part in 45 events in 13 sports.
Document 7: Norway at the 1920 Summer Olympics: Norway competed at the 1920 Summer Olympics in Antwerp, Belgium. 194 competitors, 188 men and 6 women, took part in 72 events in 16 sports.
Document 8: Je suis l'enfant soleil: "Je suis l'enfant soleil" (translated: "I Am the Sun Child" or "I'm A Child of the Sun") was the French entry in the Eurovision Song Contest 1979, performed in French by Anne-Marie David. David had won Eurovision six years earlier, representing Luxembourg at the 1973 Contest with "Tu te reconnaîtras".
Document 9: Belgium: Kingdom of Belgium Koninkrijk België (Dutch) Royaume de Belgique (French) Königreich Belgien (German) Flag Coat of arms Motto: ``Eendracht maakt macht ''(Dutch)`` L'union fait la force'' (French) ``Einigkeit macht stark ''(German)`` Unity makes Strength'' Anthem: ``La Brabançonne ''`` The Brabantian'' Location of Belgium (dark green) -- in Europe (green & dark grey) -- in the European Union (green) Capital and largest city Brussels 50 ° 51 ′ N 4 ° 21 ′ E ﻿ / ﻿ 50.850 ° N 4.350 ° E ﻿ / 50.850; 4.350 Official languages Dutch French German Ethnic groups see Demographics Religion (2015) 60.7% Christianity 32.0% No religion 5.2% Islam 2.1% Other religions Demonym Belgian Government Federal parliamentary constitutional monarchy Monarch Philippe Prime Minister Charles Michel Legislature Federal Parliament Upper house Senate Lower house Chamber of Representatives Independence (from the Netherlands) Declared 4 October 1830 Recognised 19 April 1839 Area Total 30,528 km (11,787 sq mi) (136th) Water (%) 6.4 Population 1 August 2018 census 11,420,163 (79th) Density 374.2 / km (969.2 / sq mi) (36th) GDP (PPP) 2018 estimate Total $550.664 billion (38th) Per capita $48,258 (20th) GDP (nominal) 2016 estimate Total $562.229 billion (23rd) Per capita $49,272 (17th) Gini (2011) 26.3 low HDI (2017) 0.916 very high 17th Currency Euro (€) (EUR) Time zone UTC + 1 (CET) Summer (DST) UTC + 2 (CEST) Driving side right Calling code + 32 ISO 3166 code BE Internet TLD. be The flag's official proportions of 13: 15 are rarely seen; proportions of 2: 3 or similar are more common. The Brussels region is the de facto capital, but the City of Brussels municipality is the de jure capital. The. eu domain is also used, as it is shared with other European Union member states.
Document 10: Je vais me marier, Marie: "Je vais me marier, Marie" (English translation: "I´m getting married, Mary") was the Swiss entry in the Eurovision Song Contest 1973, performed in French by Patrick Juvet.
Document 11: Patrice et Mario: Patrice et Mario were an Italian singer-guitarist duo popular in France the 1940-1950s. Patrice (Patrizzio Paganessi, 1915-26 April 1992) and Mario (Mario Moro, 1918 - 9 August 2002) were part of the vogue for Mediterranean music in France exemplified by Luis Mariano and Tino Rossi. Their popularity in Africa led to their name being used by another duo, consisting of Philippe Vungbo (alias Lando) and Cantador Rossignol.
Document 12: Athletics at the 1920 Summer Olympics: At the 1920 Summer Olympics held in Antwerp, 29 athletics events were contested, all for men only. The competitions were held from August 15, 1920 to August 23, 1920.
Document 13: Flag of Belgium: The national flag of the kingdom of Belgium (Dutch: Vlag van het koninkrijk België, French: Drapeau de la Belgique, German: Flagge Belgiens) is a tricolour of three bands of black, yellow, and red. The colours were taken from the coat of arms of the Duchy of Brabant, and the vertical design may be based on the flag of France. When flown, the black band is nearest the pole (at the hoist side). It has the unusual proportions of 13: 15.
Document 14: I Love America (Patrick Juvet song): "I Love America" is 1978 disco hit by Swiss-born performer Patrick Juvet. Along with the tracks, "Where Is My Woman" and "Got A Feeling", it peaked at number five on the disco chart in the United States. It was included in the compilation album, "A Night at Studio 54", in 1979.
Document 15: Belgium: Belgium, officially the Kingdom of Belgium, is a country in Western Europe bordered by France, the Netherlands, Germany and Luxembourg. A small and densely populated country, it covers an area of 30,528 square kilometres (11,787 sq mi) and has a population of more than 11 million. Straddling the cultural boundary between Germanic and Latin Europe, Belgium is home to two main linguistic groups: the Dutch - speaking, mostly Flemish community, which constitutes about 59 percent of the population, and the French - speaking, mostly Walloon population, which comprises about 40 percent of all Belgians. Additionally, there is a small group of German speakers, numbering around one percent, who live in the East Cantons. The capital and largest city is Brussels; other major cities are Antwerp, Ghent, Charleroi and Liège.
ground_truth: 11,420,163
sub_queries: Je vais me marier, Marie >> performer Answer: Patrick Juvet
Which country does Patrick Juvet belong to? Answer: Switzerland
Switzerland at the 1920 Summer Olympics >> country Answer: Belgium
what is the population of Belgium in 2018 Answer: 11,420,163