Question: When did the sport played by Alexander Müller become an Olympic sport?

full_context: Document 1: Snowboarding at the Winter Olympics: Snowboarding is a sport at the Winter Olympic Games. It was first included in the 1998 Winter Olympics in Nagano, Japan. Snowboarding was one of five new sports or disciplines added to the Winter Olympic program between 1992 and 2002, and was the only one not to have been a previous medal or demonstration event. In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half - pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other. Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding. Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana. However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association. For the 2002 Winter Olympics, giant slalom was expanded to add head - to - head racing and was renamed parallel giant slalom. In 2006, a third event, the snowboard cross, was held for the first time. In this event, competitors race against each other down a course with jumps, beams and other obstacles. On July 11, 2011, the International Olympic Committee's Executive Board approved the addition of Ski and Snowboard Slopestyle to the Winter Olympics roster of events, effective in 2014. The decision was announced via press conference from the IOC's meeting in Durban, South Africa. A fifth event, parallel slalom, was added only for 2014. Big air was added for 2018.
Document 2: Luge: The first organized meeting of the sport took place in 1883 in Switzerland. In 1913, the Internationale Schlittensportverband or International Sled Sports Federation was founded in Dresden, Germany. This body governed the sport until 1935, when it was incorporated in the Fédération Internationale de Bobsleigh et de Tobogganing (FIBT, International Bobsleigh and Tobogganing Federation). After it had been decided that luge would replace the sport of skeleton at the Olympic Games, the first World Championships in the sport were held in 1955 in Oslo (Norway). In 1957, the Fédération Internationale de Luge de Course (FIL, International Luge Federation) was founded. Luge events were first included in the Olympic Winter Games in 1964.
Document 3: Skeleton at the Winter Olympics: Skeleton is a winter sport featured in the Winter Olympics where the competitor rides head - first and prone (lying face down) on a flat sled. It is normally run on an ice track that allows the sled to gain speed by gravity. It was first contested at the 1928 Winter Olympics in St. Moritz and again in 1948 Winter Olympics, after which it was discontinued as an Olympic sport. Skeleton was reintroduced at the 2002 Winter Olympics, with both men's and women's events, and has been held in each Winter Olympic competition since. Skeleton is so - named as the first metal sleds introduced in 1892 were said to resemble a human skeleton.
Document 4: List of Olympic medalists in snowboarding: Snowboarding is a sport that has been contested at the Winter Olympic Games since the 1998 Winter Olympics in Nagano, Japan. Snowboarding was one of five new sports or disciplines added to the Winter Olympic programme between 1990 and 2002, and was the only one not to have been a previous medal or demonstration event. In 1998, four events, two for men and two for women, were held in two specialities: the giant slalom, a downhill event similar to giant slalom skiing; and the half - pipe, in which competitors perform tricks while going from one side of a semi-circular ditch to the other. Canadian Ross Rebagliati won the men's giant slalom and became the first athlete to win a gold medal in snowboarding. Rebagliati was briefly stripped of his medal by the International Olympic Committee (IOC) after testing positive for marijuana. However, the IOC's decision was reverted following an appeal from the Canadian Olympic Association. For the 2002 Winter Olympics, the giant slalom was dropped in favour of the parallel giant slalom, an event that involves head - to - head racing. In 2006, a third event, the snowboard cross, was held for the first time. In this event, competitors race against each other down a course with jumps, beams and other obstacles.
Document 5: FIBT World Championships 2000: The FIBT World Championships 2000 took place in Altenberg, Germany (men's bobsleigh), Winterberg, Germany (women's bobsleigh), and Igls, Austria (men's and women's skeleton). Altenberg hosted the championship event for the fourth time, doing so previously in 1991 (bobsleigh), 1994 (skeleton), and 1999 (skeleton). Winterberg hosted the championship event for the second time, doing so previously in 1995 (bobsleigh). Igls hosted the championship for the fifth time, doing do previously in 1935 (two-man) and 1963, 1991 (skeleton), and 1993 (bobsleigh). Two-woman bobsleigh and women's skeleton debuted at these championships.
Document 6: Matthias Guggenberger: Matthias Guggenberger (born 24 September 1984 in Innsbruck) is an Austrian skeleton racer who has competed since 2005. His best Skeleton World Cup finish was 3rd at Königssee
Document 7: Alexander Berner: Alexander Berner (born 1901, date of death unknown) was a Swiss skeleton racer who competed in the late 1920s. He finished fifth in the men's skeleton event at the 1928 Winter Olympics in St. Moritz.
Document 8: Alex Coomber: Alexandra Coomber (née Hamilton; born 28 December 1973) is a British skeleton racer who competed in the late 1990s and early 2000s. She won the bronze medal in the women's skeleton event at the 2002 Winter Olympics in Salt Lake City, while competing with a broken wrist, having broken it in training 10 days prior to her race.
Document 9: Frank Kleber: Frank Kleber (born 11 February 1981 in Gräfelfing) is a German skeleton racer who has competed since 2000. He won two medals at the FIBT World Championships with a gold in 2007 (Mixed team) and a bronze in 2004 (Men's skeleton).
Document 10: Alain Wicki: Alain Wicki is a Swiss skeleton racer who competed from the 1980s to the early first decade of the 21st century. He won a complete set of medals in the men's event at the FIBT World Championships with a gold in 1989, a silver in 1998, and a bronze in 1982.
Document 11: Alexander Müller (skeleton racer): Alexander Müller is an Austrian skeleton racer who competed from 1989 to 2000. He won a bronze medal in the men's skeleton event (tied with Jimmy Shea of the United States) at the 2000 FIBT World Championships in Igls.
Document 12: Martin Rettl: Martin Rettl (born 25 November 1973) is an Austrian skeleton racer who competed from 1989 to 2006. Competing in two Winter Olympics, he won a silver medal in the men's skeleton event at Salt Lake City in 2002.
Document 13: Figure skating: Figure skating is a sport in which individuals, duos, or groups perform on figure skates on ice. It was the first winter sport included in the Olympics, in 1908. The four Olympic disciplines are men's singles, ladies' singles, pair skating, and ice dance. Non-Olympic disciplines include synchronized skating, Theater on Ice, and four skating. From novice through senior - level competition, skaters generally perform two programs (short and long) which, depending on the discipline, may include spins, jumps, moves in the field, lifts, throw jumps, death spirals, and other elements or moves.
Document 14: Short track speed skating at the Winter Olympics: Short track speed skating has been a contest at the Winter Olympics since the 1992 Winter Games in Albertville, France. Prior to that, it was a demonstration sport at the 1988 games. The results from the 1988 demonstration competition is not included in the official Olympic statistics. The sport has been dominated by teams from Asia and North America, namely South Korea (IOC code KOR), China (CHN), Canada (CAN) and the United States (USA). Those four countries have won 134 of 168 medals awarded since 1992. South Korea leads the medal tally (and gold medal tally), with 42 medals including 21 golds since 1992. The majority of medals that South Korea won at the Winter Olympics came from short - track speed skating. Similarly, most of the China's Winter Olympics medals are from the sport.
Document 15: Figure skating at the Olympic Games: Figure skating was first contested in the Olympic Games at the 1908 Summer Olympics. Since 1924, the sport has been a part of the Winter Olympic Games.
ground_truth: 1928
sub_queries: Alexander Müller >> sport Answer: skeleton
when did the skeleton become an olympic sport Answer: 1928