Question: When did Swedish become the official language of the country where the Embassy of France is located in the city where Riccardo Campogiani died?

full_context: Document 1: Switzerland: Aside from the official forms of their respective languages, the four linguistic regions of Switzerland also have their local dialectal forms. The role played by dialects in each linguistic region varies dramatically: in the German-speaking regions, Swiss German dialects have become ever more prevalent since the second half of the 20th century, especially in the media, such as radio and television, and are used as an everyday language, while the Swiss variety of Standard German is almost always used instead of dialect for written communication (c.f. diglossic usage of a language). Conversely, in the French-speaking regions the local dialects have almost disappeared (only 6.3% of the population of Valais, 3.9% of Fribourg, and 3.1% of Jura still spoke dialects at the end of the 20th century), while in the Italian-speaking regions dialects are mostly limited to family settings and casual conversation.
Document 2: Languages of Sweden: Swedish evolved from Old Norse around the 14th and 15th century, and historically, the Swedish dialects were generally much more different than today. Since the 20th century Standard Swedish prevails throughout the country. The Scandinavian languages constitute a dialectal continuum and some of the traditional Swedish dialects could equally be described as Danish (Scanian) or Norwegian (Jamtlandic).
Document 3: Embassy of France, Stockholm: The Embassy of France in Stockholm is the diplomatic mission of the French Republic in Sweden. The chancery is located at Kommendörsgatan 13.
Document 4: Old English: Old English is a West Germanic language, developing out of Ingvaeonic (also known as North Sea Germanic) dialects from the 5th century. It came to be spoken over most of the territory of the Anglo-Saxon kingdoms which became the Kingdom of England. This included most of present-day England, as well as part of what is now southeastern Scotland, which for several centuries belonged to the Anglo-Saxon kingdom of Northumbria. Other parts of the island – Wales and most of Scotland – continued to use Celtic languages, except in the areas of Scandinavian settlements where Old Norse was spoken. Celtic speech also remained established in certain parts of England: Medieval Cornish was spoken all over Cornwall and in adjacent parts of Devon, while Cumbric survived perhaps to the 12th century in parts of Cumbria, and Welsh may have been spoken on the English side of the Anglo-Welsh border. Norse was also widely spoken in the parts of England which fell under Danish law.
Document 5: Dutch language: Old Dutch naturally evolved into Middle Dutch. The year 1150 is often cited as the time of the discontinuity, but it actually marks a time of profuse Dutch writing and during this period a rich Medieval Dutch literature developed. There was at that time no overarching standard language; Middle Dutch is rather a collective name for a number of closely related dialects whose ancestor was Old Dutch. But they were all mutually intelligible. In fact, since Dutch is a rather conservative language, the various literary works of that time today are often very readable for modern-day speakers.
Document 6: Embassy of France, Prague: The Embassy of France to the Czech Republic is located on Velkopřevorské náměstí, in Malá Strana, Prague, next to Vltava's island Kampa. It occupies the large baroque Buquoy Palace (1719). The ground floor of the Embassy was flooded during the August 2002 floods.
Document 7: Embassy of Sweden, Rome: The Embassy of Sweden in Rome is Sweden's diplomatic mission in Italy. The current building was built between 1965-1966 and completed in 1967.
Document 8: Different from You and Me: "Different from You and Me (§175)" centers around the well-to-do Teichmann family in Berlin. Klaus, the 17-year-old son of Werner and Christa Teichmann, has begun to lead a life that increasingly worries his parents. Although he is an outstanding student, Klaus spends most of his free time with Manfred, a low academic achiever raised by a relatively poor single mother. The two boys share an interest in the arts, and Manfred has just published a poem in the local newspaper. Klaus has to protect Manfred from classroom bullies who attack him for his effeteness.
Document 9: Maurizio Di Gati: Di Gati was born in Racalmuto, in the province of Agrigento, the hometown of the famous Sicilian writer Leonardo Sciascia. He became a barber. However, when in 1991 his elder brother Diego Di Gati was killed in a vendetta with a rival mafia-like group, the Stidda, he decided to become a 'man of honour' to avenge his brother.
Document 10: Embassy of France, London: The Embassy of France in London is the diplomatic mission of France to the United Kingdom. Located just off Knightsbridge at Albert Gate, one of the entrances to Hyde Park, it is situated immediately opposite the Embassy of Kuwait.
Document 11: Society Murders: The Society Murders is the name given to the 4 April 2002 familicide of husband and wife millionaire socialites Margaret Mary Wales-King, 69, and husband, Paul Aloysius King, 75, in Melbourne, Victoria, Australia, by Margaret's 34-year-old son, Matthew Wales. News media throughout Australia covered the crime and subsequent trial, which later became the subject of a book and a television film.
Document 12: Adam Worth: In England, Worth and his associates bought Western Lodge at Clapham Common. He also leased an apartment in Mayfair and joined high society. He formed his own criminal network and organized major robberies and burglaries through several intermediaries. Those who worked in his schemes never knew his name. He insisted that his subordinates not use violence.
Document 13: Embassy of Sweden, Prague: The Swedish Embassy to the Czech Republic is located on Úvoz street, in Hradčany, the castle region of Prague. It is close to the Strahov Monastery. The embassy has a great view of the rest of Prague because it is located up on the hill. A pedestrian path, named after Swedish diplomat Raoul Wallenberg, who saved thousands of Jews from the Holocaust, leads from embassy up to the Petrin Hill.
Document 14: Old English: Old English developed from a set of Anglo-Frisian or North Sea Germanic dialects originally spoken by Germanic tribes traditionally known as the Angles, Saxons, and Jutes. As the Anglo-Saxons became dominant in England, their language replaced the languages of Roman Britain: Common Brittonic, a Celtic language, and Latin, brought to Britain by Roman invasion. Old English had four main dialects, associated with particular Anglo-Saxon kingdoms: Mercian, Northumbrian, Kentish and West Saxon. It was West Saxon that formed the basis for the literary standard of the later Old English period, although the dominant forms of Middle and Modern English would develop mainly from Mercian. The speech of eastern and northern parts of England was subject to strong Old Norse influence due to Scandinavian rule and settlement beginning in the 9th century.
Document 15: Riccardo Campogiani: The Campogiani case was special as it involved youth from upper-class areas of Stockholm, with both the murdered and the defendants coming from families of wealthy backgrounds.
ground_truth: 20th century
sub_queries: Riccardo Campogiani >> place of death Answer: Stockholm
Embassy of France, Stockholm >> country Answer: Sweden
when did swedish become the official language of Sweden Answer: 20th century