Question: What percentage of people in the country where Vostok Stadium is located use Russian as their main language?

full_context: Document 1: Russian language: In Armenia 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 15,000 native speakers of Russian in the country, and 1 million active speakers. 30% of the population was fluent in Russian in 2006, and 2% used it as the main language with family, friends or at work. Russian is spoken by 1.4% of the population according to a 2009 estimate from the World Factbook.
Document 2: 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 3: Russian language: In Ukraine, Russian is seen as a language of inter-ethnic communication, and a minority language, under the 1996 Constitution of Ukraine. According to estimates from Demoskop Weekly, in 2004 there were 14,400,000 native speakers of Russian in the country, and 29 million active speakers. 65% of the population was fluent in Russian in 2006, and 38% used it as the main language with family, friends or at work. Russian is spoken by 29.6% of the population according to a 2001 estimate from the World Factbook. 20% of school students receive their education primarily in Russian.
Document 4: 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 5: Oskemen: Oskemen (Kazakh: Өскемен, romanized: Óskemen) or Ust-Kamenogorsk (Russian: Усть-Каменого́рск)  is the administrative center of East Kazakhstan Region of Kazakhstan. It is served by Oskemen Airport. Population: 303,720 (2009 Census results); 310,950 (1999 Census results).
Document 6: Vostok Stadium: Vostok Stadium is a multi-use stadium in Oskemen, Kazakhstan. It is currently used mostly for football matches and is the home stadium of FC Vostok.
Document 7: 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 8: 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 9: 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 10: 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 11: Munaishy Stadium: Munayshy Stadium is a multi-use stadium in Atyrau, Kazakhstan. It is currently used mostly for football matches and is the home stadium of FC Atyrau.
Document 12: Metalist Oblast Sports Complex: "Metalist" Oblast Sports Complex (), which includes the Metalist Stadium (), is a multi-use stadium in Kharkiv, Ukraine. It is currently used chiefly for football matches and is the home of FC Metalist 1925 Kharkiv and Shakhtar Donetsk. The stadium, which was a venue for Euro 2012, currently seats 40,003.
Document 13: Zvezda Stadium: Star (Zvezda) Stadium (), until 1991 Lenin Komsomol Stadium (), is a multi-use stadium in Perm, Russia. It is currently used mostly for football matches and is the home ground of FC Amkar Perm. The stadium holds 17,000 people and was opened on June 5, 1969.
Document 14: Zhetysu Stadium: Zhetysu Stadium (, "Jetisý stadıony") is a multi-use stadium in Taldykorgan, Kazakhstan. It is currently used mostly for football matches and hosts the home matches of FC Zhetysu.
Document 15: Sodovik Stadium: Sodovik Stadium is a multi-use stadium in Sterlitamak, Russia. It is currently used mostly for football matches and was the home ground of the former football team FC Sodovik Sterlitamak. The stadium holds 5,180 people and was opened in 2000.
ground_truth: 46%
sub_queries: Vostok Stadium >> country Answer: Kazakhstan
What percent of people in Kazakhstan use Russian as their main language? Answer: 46%