Question: What was the 2018 population in the country of the 1920 Summer Olympics involving the nation with the Japanese School in the city where Christina went in Grey's Anatomy?

full_context: Document 1: Belgium: Belgium was the first continental European country to undergo the Industrial Revolution, in the early 19th century. Liège and Charleroi rapidly developed mining and steelmaking, which flourished until the mid-20th century in the Sambre and Meuse valley and made Belgium among one of the three most industrialized nations in the world from 1830 to 1910. However, by the 1840s the textile industry of Flanders was in severe crisis, and the region experienced famine from 1846 to 1850.After World War II, Ghent and Antwerp experienced a rapid expansion of the chemical and petroleum industries. The 1973 and 1979 oil crises sent the economy into a recession; it was particularly prolonged in Wallonia, where the steel industry had become less competitive and experienced serious decline. In the 1980s and 1990s, the economic center of the country continued to shift northwards and is now concentrated in the populous Flemish Diamond area.By the end of the 1980s, Belgian macroeconomic policies had resulted in a cumulative government debt of about 120% of GDP. As of 2006, the budget was balanced and public debt was equal to 90.30% of GDP. In 2005 and 2006, real GDP growth rates of 1.5% and 3.0%, respectively, were slightly above the average for the Euro area. Unemployment rates of 8.4% in 2005 and 8.2% in 2006 were close to the area average. By October 2010, this had grown to 8.5% compared to an average rate of 9.6% for the European Union as a whole (EU 27). From 1832 until 2002, Belgium's currency was the Belgian franc. Belgium switched to the euro in 2002, with the first sets of euro coins being minted in 1999. The standard Belgian euro coins designated for circulation show the portrait of the monarch (first King Albert II, since 2013 King Philippe).
Document 2: Cristina Yang: At the end of season 10, she says goodbye to her fellow co-workers she has come to know and love including Owen and Meredith. Cristina and Meredith share special moments together reminiscing about all the horrors they went through and dancing it out one last time. Cristina leaves for Zurich with surgical intern Shane Ross, who chooses to leave in order to study under her abroad.
Document 3: 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 4: American School in Japan: The American School in Japan (ASIJ; ) is an international private day school located in the city of Chōfu, Tokyo, Japan. The school consists of an elementary school, a middle school, and a high school, all located on the Chōfu campus. There is also an early learning center (nursery-kindergarten) for children aged 3–5 located in the Roppongi Hills complex in downtown Tokyo. Instruction is in English and follows an American-style curriculum. About two thirds of the school's students are the children of citizens of a wide variety of countries who are on temporary assignment in Japan, and the remaining one third are Japanese students who speak English. The campus is fenced in, resulting from heightened security measures taken after the September 11 attacks, with campus surroundings including the Nogawa Park and the neighborhood of Tama. The "Good Schools Guide International" called ASIJ "an impressive school, not only for its size and facilities but also for its strong sense of where it is going."
Document 5: 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 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: 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 9: Cristina Yang: Cristina accepts the offer and interviews candidates for her replacement position at the hospital, including Maggie Pierce for new chief of cardio. Cristina transfers her hospital shares to Alex Karev and recommends he take over her seat on the board.
Document 10: Sarajevo International School: QSI International School of Sarajevo is an international school in Sarajevo, Bosnia and Herzegovina. The language of instruction is English. The curriculum is based on US National Standards with the addition of three foreign languages. The school is funded by tuition fees. Students range from 3 to 18 years of age. The school's Director is Gale Stubbs. The school is located in Vogošća, a quiet suburb of Sarajevo. It has approximately 150 students, representing 37 nationalities.
Document 11: Munich International School: Munich International School (MIS) is a private international school located in Starnberg, south of Munich, Germany. MIS teaches students from EC (Early Child - years 4-5) to grade 12. Students travel from an area around Munich to attend the school, with the help of a school bus network that reaches into the area around Munich, even all the way to Garmisch-Partenkirchen. The School is divided into three groups: Junior, Middle, and Senior School.
Document 12: Cristina Yang: At the end of season 10, she says goodbye to her fellow co-workers she has come to know and love including Owen and Meredith. Cristina and Meredith share special moments together reminiscing about all the horrors they went through and dancing it out one last time. Cristina leaves for Zurich with surgical intern Shane Ross, who chooses to leave in order to study under her in Switzerland.
Document 13: 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.
Document 14: 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 15: Japanese School in Zurich: The Japanese School in Zurich (, "Chūrihhi Nihonjin Gakkō") is a Japanese international school in Uster, Canton of Zürich, Switzerland, situated in the Zurich metropolitan area. It has a day school division and it has a weekend complementary school that meets on Wednesdays and Saturdays. It is the sole non-boarding Japanese day school in Switzerland, and it serves kindergarten, elementary school, and junior high school (equivalent to Zurich cantonal Sekundarstufe I).
ground_truth: 11,420,163
sub_queries: where did christina from grey's anatomy go Answer: Zurich
Japanese School in Zurich >> country Answer: Switzerland
Switzerland at the 1920 Summer Olympics >> country Answer: Belgium
what is the population of Belgium in 2018 Answer: 11,420,163