Question: When did the country containing Pulmankijärvi join the Russian Empire?

full_context: Document 1: Lake Ruovesi: Lake Ruovesi is a medium-sized lake in Finland. It is situated in the municipalities of Ruovesi and Mänttä-Vilppula in the Pirkanmaa region in western Finland. The lake is a part of the Kokemäenjoki basin and its main inflows are the Lake Tarjanne in north and the Lake Kuorevesi in the east. The lake drains into the lake Palovesi in south, which in its turn drains into the lake Näsijärvi.
Document 2: Finland: Finland (/ ˈfɪnlənd / (listen); Finnish: Suomi (suo̯mi) (listen); Swedish: Finland (ˈfɪnland)), officially the Republic of Finland (Finnish: Suomen tasavalta, Swedish: Republiken Finland), is a sovereign state in Northern Europe. The country has land borders with Sweden to the northwest, Norway to the north, and Russia to the east. To the south is the Gulf of Finland with Estonia on the opposite side. Finland is a Nordic country situated in the geographical region of Fennoscandia, which also includes Scandinavia.
Document 3: Russian language: As the Grand Duchy of Finland was part of the Russian Empire from 1809 to 1918, a number of Russian speakers have remained in Finland. There are 33,400 Russian-speaking Finns, amounting to 0.6% of the population. Five thousand (0.1%) of them are late 19th century and 20th century immigrants or their descendants, and the remaining majority are recent immigrants who moved there in the 1990s and later.[citation needed] Russian is spoken by 1.4% of the population of Finland according to a 2014 estimate from the World Factbook.
Document 4: Russian language: In the 20th century, Russian was mandatorily taught in the schools of the members of the old Warsaw Pact and in other countries that used to be satellites of the USSR. In particular, these countries include Poland, Bulgaria, the Czech Republic, Slovakia, Hungary, Albania, former East Germany and Cuba. However, younger generations are usually not fluent in it, because Russian is no longer mandatory in the school system. According to the Eurobarometer 2005 survey, though, fluency in Russian remains fairly high (20–40%) in some countries, in particular those where the people speak a Slavic language and thereby have an edge in learning Russian (namely, Poland, Czech Republic, Slovakia, and Bulgaria).
Document 5: Onkamojärvi: Onkamojärvi () is a lake in Salla municipality, Lapland, Finland. It is located on the border of Finland and Russia, most of the lake being on the Finnish side of the border. The lake's surface is 290.5 metres above sea level, and its area is about 18 km². There are 32 islands in the lake, including Kallunkisaari, Karvastekemäsaari, Kätkänsuusaari, Lujesaaret, Majavasaari, Markuksen aittasaari, Nilisaari, Oravasaari, Paltsarsaari, Peurasaari, Saaranpaskantamasaari, Talvitiensuusaari, Tossonsaari and Vitsinsaari.
Document 6: Nilakka: Nilakka is a rather large lake in Northern Savonia, Finland. With the area of nearly 169 km² it is the 25th largest lake in the country. It's a shallow lake, connected by canals to upper Lake Pielavesi and lower Iisvesi.
Document 7: Russian language: According to figures published in 2006 in the journal "Demoskop Weekly" research deputy director of Research Center for Sociological Research of the Ministry of Education and Science (Russia) Arefyev A. L., the Russian language is gradually losing its position in the world in general, and in Russia in particular. In 2012, A. L. Arefyev published a new study "Russian language at the turn of the 20th-21st centuries", in which he confirmed his conclusion about the trend of further weakening of the Russian language in all regions of the world (findings published in 2013 in the journal "Demoskop Weekly"). In the countries of the former Soviet Union the Russian language is gradually being replaced by local languages. Currently the number speakers of Russian language in the world depends on the number of Russians in the world (as the main sources distribution Russian language) and total population Russia (where Russian is an official language).
Document 8: Lake Päijänne: Lake Päijänne () is the second largest lake in Finland (). The lake drains into the Gulf of Finland via the Kymi River. The major islands are from north to south Vuoritsalo, Muuratsalo, Onkisalo, Judinsalo, Edessalo, Taivassalo, Haukkasalo, Vehkasalo, Mustassalo, Virmailansaari and Salonsaari. The largest island is Virmailansaari. The word "saari" means an island. "Salo" once meant a great island, nowadays it means a great forest area.
Document 9: Russian language: In Kazakhstan Russian is not a state language, but according to article 7 of the Constitution of Kazakhstan its usage enjoys equal status to that of the Kazakh language in state and local administration. According to estimates from Demoskop Weekly, in 2004 there were 4,200,000 native speakers of Russian in the country, and 10 million active speakers. 63% of the population was fluent in Russian in 2006, and 46% used it as the main language with family, friends or at work. According to a 2001 estimate from the World Factbook, 95% of the population can speak Russian. Large Russian-speaking communities still exist in northern Kazakhstan, and ethnic Russians comprise 25.6% of Kazakhstan's population. The 2009 census reported that 10,309,500 people, or 84.8% of the population aged 15 and above, could read and write well in Russian, as well as understand the spoken language.
Document 10: Russian language: Ethnic Russians constitute 25.5% of the country's current population and 58.6% of the native Estonian population is also able to speak Russian. In all, 67.8% of Estonia's population can speak Russian. Command of Russian language, however, is rapidly decreasing among younger Estonians (primarily being replaced by the command of English). For example, if 53% of ethnic Estonians between 15 and 19 claim to speak some Russian, then among the 10- to 14-year-old group, command of Russian has fallen to 19% (which is about one-third the percentage of those who claim to have command of English in the same age group).
Document 11: Roine (Finland): Roine is a medium-sized lake in Finland. The lake is located in the Pirkanmaa region, mostly in the municipality of Kangasala and for a lesser part in the municipality of Pälkäne.
Document 12: Russian language: In Georgia Russian has no official status, but it's recognised as a minority language under the Framework Convention for the Protection of National Minorities. According to estimates from Demoskop Weekly, in 2004 there were 130,000 native speakers of Russian in the country, and 1.7 million active speakers. 27% of the population was fluent in Russian in 2006, and 1% used it as the main language with family, friends or at work. Russian is the language of 9% of the population according to the World Factook. Ethnologue cites Russian as the country's de facto working language.
Document 13: Russian language: Significant Russian-speaking groups also exist in Western Europe. These have been fed by several waves of immigrants since the beginning of the 20th century, each with its own flavor of language. The United Kingdom, Spain, Portugal, France, Italy, Belgium, Greece, Brazil, Norway, and Austria have significant Russian-speaking communities. According to the 2011 Census of Ireland, there were 21,639 people in the nation who use Russian as a home language. However, of this only 13% were Russian nationals. 20% held Irish citizenship, while 27% and 14% were holding the passports of Latvia and Lithuania respectively.
Document 14: Pulmankijärvi: Pulmankijärvi is a medium-sized lake in the region of Lapland in Finland. The northern part of the lake belongs to Norway.
Document 15: Russian language: The language was first introduced in North America when Russian explorers voyaged into Alaska and claimed it for Russia during the 1700s. Although most colonists left after the United States bought the land in 1867, a handful stayed and preserved the Russian language in this region to this day, although only a few elderly speakers of this unique dialect are left. Sizable Russian-speaking communities also exist in North America, especially in large urban centers of the U.S. and Canada, such as New York City, Philadelphia, Boston, Los Angeles, Nashville, San Francisco, Seattle, Spokane, Toronto, Baltimore, Miami, Chicago, Denver and Cleveland. In a number of locations they issue their own newspapers, and live in ethnic enclaves (especially the generation of immigrants who started arriving in the early 1960s). Only about 25% of them are ethnic Russians, however. Before the dissolution of the Soviet Union, the overwhelming majority of Russophones in Brighton Beach, Brooklyn in New York City were Russian-speaking Jews. Afterward, the influx from the countries of the former Soviet Union changed the statistics somewhat, with ethnic Russians and Ukrainians immigrating along with some more Russian Jews and Central Asians. According to the United States Census, in 2007 Russian was the primary language spoken in the homes of over 850,000 individuals living in the United States.
ground_truth: 1809
sub_queries: Pulmankijärvi >> country Answer: Finland
When did Finland join the Russian Empire? Answer: 1809