Question: When did Alanders rejoin the country that has a football league with Marcus Mårtensson playing?

full_context: Document 1: List of archipelagos by number of islands: Location (total number of islands) Name of the archipelagos Number of islands, islets, reefs, coral reefs and cays Norway Norwegian Archipelago 240,000 Finland Archipelago Sea 40,000 (approx.) Canada Canadian Arctic Archipelago 36,563 Canada Thirty Thousand Islands 30,000 (approx.) Stockholm archipelago, Sweden (34,316) Stockholm archipelago 28,945 Södermanland archipelago, Sweden Södermanland archipelago 5,371 Indonesia Indonesian Archipelago 17,508 -- 18,306 Philippines Philippine Archipelago 7,641 Swedish East Coast Archipelago (21,628) Småland archipelago 12,740 Östergötland archipelago 8,888 Sweden Öregrund archipelago 9,722 The Bahamas 3,200 Bahama Archipelago 3,200 Japanese archipelago 6,852 Seto Inland Sea 3,000 Finland Kvarken Archipelago 6,500 British Isles British Isles 6,289 China (5,000) Zhoushan Archipelago 1,390 (islands) Korea Korean Peninsula 3,579 Queensland, Australia Great Barrier Reef 2,900 (reefs), 900 (islands) Chile Chile 2,324 Quảng Ninh Province, Vietnam Ha Long Bay 1,960 -- 2,000 Saint Lawrence River, Canada -- United States border Thousand Islands 1,864 Thailand Thailand 1,430 India Andaman and Nicobar Islands, Lakshadweep Islands, Coastal India 1208 Greece Aegean Sea 1,200 -- 6,000 Croatia Dalmatia 1,200 Maldives Maldive Islands 1,192 (coral islands) Estonia West Estonian archipelago 900 Italy Italy 800 Falkland Islands Falkland Islands 776 New Zealand New Zealand Archipelago 600 Turkey Aegean Sea, Marmara Sea, Black Sea 500 (approx.)
Document 2: Örebro SK: The 2003 season under new coach Stefan Lundin started well for Örebro, but yet again a poor ending of the season saw the team end up in eighth place. Promising goalkeeper John Alvbåge and Danish veteran Lars Larsen introduced themselves and soon became favourites of the Örebro crowd. The 2004 season became one of the darkest years in club history. First, Örebro had to fight hard to avoid relegation. A heroic effort with five straight wins at the end of the season earned a mid table finishing (seventh, later amended to eighth), but in the end effort proved futile. Economic problems had haunted ÖSK for a period of time as the club faced major deficits. Even after yet another heroic attempt by both supporters and sponsors the club was relegated by "Elitlicensnämnden" (eng: The Elite license board), who ruled that the balance sheet of the club did not comply with the standards of the Swedish Football Association. Örebro SK's appeal failed and the club was forced to play in Superettan.
Document 3: Juanan: After his contract with the Galicians ended, Juanan joined another side in the third level, Real Madrid Castilla, appearing in 29 games (all starts) in his second year as the Real Madrid reserves fell short in the promotion playoffs. In late June 2011, he moved to Germany and signed for Fortuna Düsseldorf.
Document 4: 2013 Superettan: The 2013 Superettan, part of the 2013 Swedish football season, was the 13th season of Sweden's second-tier football league in its current format. The 2013 fixtures were released on 18 December 2012. The season started on 6 April 2013 and ended on 2 November 2013.
Document 5: Baltic Sea: Since May 2004, with the accession of the Baltic states and Poland, the Baltic Sea has been almost entirely surrounded by countries of the European Union (EU). The only remaining non-EU shore areas are Russian: the Saint Petersburg area and the exclave of the Kaliningrad Oblast.
Document 6: Daniel Majstorović: He started his career with IF Brommapojkarna in his native Sweden. After a year with the club, he moved to German side SC Fortuna Köln in 1997, subsequently moving back to Sweden just a year later when he signed for Västerås SK. His form then earned him a move to Malmö FF, where he won his first trophy, the 2004 Allsvenskan, and his first international call-up for the Swedish national team in 2003.
Document 7: Jonas Lundén: Jonas Lundén is a Swedish former footballer who last played for GAIS in Allsvenskan. He notably also played for IF Elfsborg and IFK Göteborg. Lundén played as a forward early in his career but at Elfsborg he was reschooled as a winger and full back. In 2001, he played one game for the Sweden national football team. He received a degree of fame amongst football computer game fans as one of the best prospects in SI Games' - one of a golden generation of Swedish youngsters who found fame outside of Sweden due to the cult football management game.
Document 8: 2014 Superettan: The 2014 Superettan, part of the 2014 Swedish football season, was the 14th season of Superettan, Sweden's second-tier football league in its current format. The 2014 fixtures were released on 20 December 2013. The season started on 5 April 2014 and concluded on 2 November 2014.
Document 9: Johan Mårtensson: Johan Mårtensson (born 16 February 1989) is a Swedish footballer who plays as a midfielder for Örebro SK in Allsvenskan.
Document 10: 2009 Superettan: The Superettan 2009 was the ninth season of Sweden's second-tier football league. The season began on 11 April 2009 and ended on 24 October 2009.
Document 11: Marcus Mårtensson: Marcus Mårtensson (born 23 April 1990) is a Swedish footballer who plays for Stafsinge IF on loan from Falkenbergs FF as a midfielder.
Document 12: 2015 Superettan: The 2015 Superettan, part of the 2015 Swedish football season, was the 15th season of Superettan, Sweden's second-tier football league in its current format. The 2015 fixtures were released in December 2014. The season began on 3 April 2015 and ended on 1 November 2015. A total of 16 teams contested the league.
Document 13: Libis Arenas: He started his career with Envigado Fútbol Club. S.S. Lazio then made a deal to buy him, but did not include him in the first team in order not to fill a non-EU spot in the squad. He was on loan to Envigado in January 2007. He had also been on trial to Sporting Clube de Portugal in early 2007.
Document 14: Tobias Nilsson: After the season had finished Nilsson told the club that he wanted more playing time and when Superettan club Örebro SK made a bid for the midfielder he decided to sign with them in January 2013.
Document 15: League of Nations: Åland is a collection of around 6,500 islands in the Baltic Sea, midway between Sweden and Finland. The islands are almost exclusively Swedish-speaking, but in 1809, the Åland Islands, along with Finland, were taken by Imperial Russia. In December 1917, during the turmoil of the Russian October Revolution, Finland declared its independence, but most of the Ålanders wished to rejoin Sweden. The Finnish government considered the islands to be a part of their new nation, as the Russians had included Åland in the Grand Duchy of Finland, formed in 1809. By 1920, the dispute had escalated to the point that there was danger of war. The British government referred the problem to the League's Council, but Finland would not let the League intervene, as they considered it an internal matter. The League created a small panel to decide if it should investigate the matter and, with an affirmative response, a neutral commission was created. In June 1921, the League announced its decision: the islands were to remain a part of Finland, but with guaranteed protection of the islanders, including demilitarisation. With Sweden's reluctant agreement, this became the first European international agreement concluded directly through the League.
ground_truth: December 1917
sub_queries: Marcus Mårtensson >> member of sports team Answer: Falkenbergs FF
Falkenbergs FF >> league Answer: Superettan
2014 Superettan >> country Answer: Sweden
When did Alanders rejoin Sweden ? Answer: December 1917