Question: When did Swedish become the official language of the country for Winhill/Losehill?

full_context: Document 1: Geography of Sweden: Sweden is a country in Northern Europe on the Scandinavian Peninsula. It borders Norway to the west; Finland to the northeast; and the Baltic Sea and Gulf of Bothnia to the south and east. At , Sweden is the 55th largest country in the world. It is the fifth largest in Europe and the largest in Northern Europe.
Document 2: Finland: Finnish and Swedish are the official languages of Finland. Finnish predominates nationwide while Swedish is spoken in some coastal areas in the west and south and in the autonomous region of Åland. The native language of 89% of the population is Finnish, which is part of the Finnic subgroup of the Uralic languages. The language is one of only four official EU languages not of Indo-European origin. Finnish is closely related to Karelian and Estonian and more remotely to the Sami languages and Hungarian. Swedish is the native language of 5.3% of the population (Swedish-speaking Finns).The Nordic languages and Karelian are also specially treated in some contexts.
Document 3: Phillip Hill: Phillip Hill is an American bass and guitar player. He was born in Nashville, Tennessee, on November 3, 1972. He has been involved in several pop punk bands, including Teen Idols, Screeching Weasel, The Independents, Common Rider, Even in Blackouts, The Queers and the Kobanes. Hill is also a skilled vocalist. He has worked extensively as a recording engineer. His audio engineering credentials appear on numerous albums with a wide spectrum of musical styles, from the pop-punk sounds of bands such as Anti-Flag, Rise Against, Screeching Weasel and his own band, Teen Idols, to the heavy, "death metal" sounds of Human Filleted and Catatonic Atrocity, as well as the country-roots, folksy-blues sounds of The Clayton Miller Blues Band and Appalachian String Band.
Document 4: Hill of Thieves: Hill of Thieves is the fourth solo album by Irish folk singer Cara Dillon. It is her first full-length release on Charcoal Records, the label formed in 2008 with her musical partner and husband Sam Lakeman. The album was recorded and produced by Sam and first became available in October 2008 at their live concerts. It is also the first release since she gave birth to their twin boys Noah and Colm at 26 weeks, after going into labour onstage at the Swindon Arts Centre, UK. It has been the most successful of her first four albums in relation to chart performance, entering at No. 7 in the UK Indie Album Charts (see below for more.)
Document 5: 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 6: Hindscarth: Hindscarth is a mountain between the valleys of Buttermere and Newlands, in the north-western part of the English Lake District. The fell's name is derived from two words from the Old Norse language, "Hind" and "Skarth", and means the pass used by the red deer.
Document 7: Lugnet Hills: Lugnet HS134 is a large ski jumping hill located in Falun, Sweden. It has a hill size of HS134, a construction point of K-120. The hill has artificial lighting and bleachers for 15,000 viewers. Hill size has been increased from K-115, HS124 to K-120, HS134. The hill was built specifically for the World Cup Ski Championships in 1974. Last modernization took place from August 2012 to end of 2013 because of the preparations for the 2015 FIS Nordic World Ski Championships.
Document 8: Miike Snow: Miike Snow was formed in 2007 in Stockholm, Sweden. Band members Christian Karlsson and Pontus Winnberg were childhood friends who spent time playing in bands and working on various projects in studios throughout the city of Gothenburg. Karlsson was a former member of the Swedish hip-hop band Goldmine, who toured with The Fugees. After separate moves to Stockholm, they reunited in 2000.
Document 9: 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 10: Winhill/Losehill: Winhill/Losehill is a Swedish six-member musical band from Umeå, Sweden led by vocalist Jonas Svennem Lundberg. The band's name is taken from two mountains located in the English village of Hope, Derbyshire, namely Win Hill and Lose Hill. It is a tribute to the location where Jonas Svennem Lundberg took part in a folk music camp at a younger age.
Document 11: Binsey: Binsey is a hill on the northern edge of the Lake District in Cumbria, England. It is detached from the rest of the Lakeland hills, and thus provides a good spot to look out at the Northern and North Western Fells of the Lake District, as well as the coastal plain and, across the Solway Firth, Scotland. Snaefell on The Isle of Man is also visible on a clear day. It is the northernmost of the Wainwrights.
Document 12: 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 13: Silver How: Silver How is a fell in the English Lake District, standing over the village of Grasmere. How, derived from the Old Norse word "haugr", is a common local term for a hill or mound.
Document 14: 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 15: 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.
ground_truth: 20th century
sub_queries: Which was the country for Winhill/Losehill? Answer: Sweden
when did swedish become the official language of Sweden Answer: 20th century