Question: What year did the stadium where the 1983 FIFA World Youth Championship final was held open in?

full_context: Document 1: Mexico City: Mexico City, or the City of Mexico (Spanish: "Ciudad de México" , ] ; abbreviated as CDMX), is the capital and most populous city of Mexico. Mexico City is one of the most important financial centers in the Americas. It is located in the Valley of Mexico ("Valle de México"), a large valley in the high plateaus at the center of Mexico, at an altitude of 2240 m . The city consists of sixteen municipalities.
Document 2: Estadio Azteca: The Estadio Azteca (] ) is a football stadium located in the suburb of Santa Úrsula in Mexico City, Mexico. Since its opening in 1966, the stadium has been the official home stadium of the professional Mexican football team América and the official national stadium of the Mexico national football team. With an official capacity of 87,000, it is the largest stadium in Mexico. The stadium sits at an altitude of 7,200 feet above sea level.
Document 3: 1981 FIFA World Youth Championship: The 1981 FIFA World Youth Championship, the third edition of the FIFA World Youth Championship, was held in Australia from 3 to 18 October 1981. The tournament took place in six venues—where a total of 32 matches were played. Adelaide, Brisbane, Canberra, Melbourne, Newcastle and Sydney—The winner was West Germany, who beat surprising Qatar by 4–0, in a final held at Sydney Cricket Ground.
Document 4: Estadio Monumental Antonio Vespucio Liberti: Estadio Antonio Vespucio Liberti (] ), also referred to as River Plate Stadium, Monumental de Núñez or simply El Monumental, is a stadium in the Núñez district of Buenos Aires, Argentina, home of the football club River Plate. It was opened on 25 May 1938 and named after former club president Antonio Vespucio Liberti. It is the largest stadium in Argentina with a capacity of 62.000 and also home of the Argentina national football team. It was the main venue in the 1951 Pan American Games and in the 1978 FIFA World Cup which hosted the final between Argentina and the Netherlands. Additionally, it hosted four finals of the Copa América, most recently in 2011 for the 2011 Copa América.
Document 5: 1985 FIFA World Youth Championship: The 1985 FIFA World Youth Championship, the fifth edition of the FIFA World Youth Championship, was held in the Soviet Union (USSR) from August 24 to September 7, 1985. The tournament took place in ten venues within eight host cities — Baku, Yerevan, Leningrad, Minsk (2), Moscow, Hoktemberyan, Tbilisi (2) and Sumqayit — where a total of 32 matches were played. The winner was Brazil, which managed to retain the title, by beating Spain by 1–0, in the final played at Moscow's Luzhniki Stadium.
Document 6: 1979 FIFA World Youth Championship: The 1979 FIFA World Youth Championship, the second staging of the FIFA World Youth Championship, was held in Japan from August 26 to September 7, 1979. The tournament took place in four venues — Kobe, Omiya, Tokyo and Yokohama — where a total of 32 matches were played, four more than in the previous edition due to the addition of a quarterfinal round in the knockout stage. The winner was Argentina, who beat holders Soviet Union by 3–1, in a final held at Tokyo's National Stadium.
Document 7: 1983 African Youth Championship: The African Youth Championship 1983 was contested through home and away matches. It also served as qualification for the 1983 FIFA World Youth Championship.
Document 8: 1983 FIFA World Youth Championship: The 1983 FIFA World Youth Championship, the fourth edition of the FIFA World Youth Championship, was held in Mexico from June 2 to June 19, 1983. The tournament took place in seven venues — Guadalajara, Irapuato, León, Mexico City, Monterrey, Puebla and Toluca — where a total of 32 matches were played. The winner was Brazil, who beat Argentina by 1–0, in a final held at Mexico City's Azteca Stadium.
Document 9: 1983 South American U-20 Championship: The South American Youth Championship 1983 was held in Cochabamba, La Paz and Santa Cruz, Bolivia. It also served as qualification for the 1983 FIFA World Youth Championship.
Document 10: 1977 FIFA World Youth Championship: The 1977 FIFA World Youth Championship was the inaugural staging of the FIFA World Youth Championship and was held in Tunisia from 27 June to 10 July 1977. The tournament took place in three venues — Tunis, Sousse and Sfax — where a total of 28 matches were played, the smallest number in its history. The winner was USSR, who beat Mexico by a penalty shootout, in a final held at Tunis's Stade El Menzah.
Document 11: Estadio B'Air: Estadio Nido de los Aguilas, officially known due to sponsorship as Estadio B'Air, is a stadium in Mexicali, Mexico. It is primarily used for baseball and serves as the home stadium for Águilas de Mexicali, members of the LMP. The first home of the team was the legendary Estadio Parque Hidalgo where the Mexicali teams played in leagues affiliated to the National Association of Professional Baseball Leagues from 1948 to 1958. Since 1976 El Nido was used to venture into the mighty Mexican Pacific League's winter circuit. The property is now known by the name of Estadio B'Air, and has a capacity of over 19,500 spectators. Its modern facilities include a club house with all amenities for the players and coaches, with a lounge, dining room, jacuzzi baths and gymnasium space for a first-level weights. For its part, the dugout is the most comfortable and suitable to the demands of professional baseball today.
Document 12: Estadio Corona (1970): The Corona Stadium (the name comes from the beer brand) was one of the smallest football (soccer) stadiums in Mexico having only capacity for 20,100 seats. It was located in the city of Torreón, Coahuila. This sport facility was used mostly for football games and was the home of the club Santos Laguna. This stadium did not host any FIFA World Cup games because of its limited size and facilities. In 2004 this stadium hosted several games of the Copa Libertadores.
Document 13: Azadi Stadium: The Azadi Stadium (Persian: ورزشگاه آزادی‎ ‎ "varzeshgāh-e āzādi") formerly known as Aryamehr Stadium (Persian: ورزشگاه آریامهر‎ ‎ "varzeshgāh-e āryāmehr") is an all-seater football stadium in Tehran, Iran. The stadium was designed by SOM and inaugurated on 18 October 1971; it is self-owned by Esteghlal F.C. and Persepolis F.C.. It is also the home stadium of the Iran national football team. It has a current capacity of 78,116 spectators, though it has been able to hold more than that during special matches. The stadium is part of the much larger Azadi Sport Complex, and is surrounded by a rowing river, football training pitches, a weightlifting complex, swimming facilities and indoor volleyball and futsal courts, among many other amenities.
Document 14: Nicaragua National Football Stadium: The Nicaragua National Football Stadium (Estadio Nacional de Fútbol) in Managua, Nicaragua, is home to the Nicaragua national football team. The official ribbon-cutting ceremony, attended by FIFA president Sepp Blatter, occurred on April 14, 2011. The first official game was a men's national team match featuring Nicaragua and Panama in a FIFA World Cup 2014 qualifying match, on September 6, 2011.
Document 15: 1993 FIFA World Youth Championship: The 1993 FIFA World Youth Championship took place in Australia for second time from 5 to 20 March 1993. The 1993 championship was the 9th contested. The tournament took place in five venues: Sydney, Canberra, Brisbane, Melbourne and Adelaide. The tournament was to be held originally in Yugoslavia, but was moved to Australia due to the Yugoslav Wars.
ground_truth: 1966