Question: What was the 2018 population of the host of the 1920 Summer Olympics, that involved the country that has a spiral viaduct in the birthplace of Karin Thomas?

<P0-S0> be The flag's official proportions of 13: 15 are rarely seen; proportions of 2: 3 or similar are more common. <P0-S1> 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. <P0-S2> The Brussels region is the de facto capital, but the City of Brussels municipality is the de jure capital. <P0-S3> The. <P0-S4> eu domain is also used, as it is shared with other European Union member states. <SEP> <P1-S0> Karin Thomas (born 3 October 1961 in Brusio) was a Swiss cross country skier who competed from 1982 to 1988. <P1-S1> She finished sixth in the 4 x 5 km relay at the 1984 Winter Olympics in Sarajevo and fourth in that same event at the 1988 Winter Olympics in Calgary. <SEP> <P2-S0> 77 competitors, all men, took part in 45 events in 13 sports. <P2-S1> Switzerland competed at the 1920 Summer Olympics in Antwerp, Belgium. <SEP> <P3-S0> åsa karin sandlund (born 11 may 1979 in linköping, östergötland) is a former freestyle swimmer from sweden, who competed for her native country at the 1996 summer olympics in atlanta, georgia. <P3-S1> there she was a member of the women's 4×200 m freestyle relay team that ended up in ninth place, teaming up with louise jöhncke, josefin lillhage, and johanna sjöberg. <SEP> <P4-S0> A signature structure of the World Heritage-listed Bernina railway, it is located near Brusio, in the Canton of Graubünden, Switzerland, and was built to limit the railway's gradient at that location within its specified maximum of 7%. <SEP> <P5-S0> the brusio spiral viaduct (or brusio circular viaduct; italian: viadotto elicoidale di brusio, german: kreisviadukt brusio) is a single-track nine-arched stone spiral railway viaduct.