Question: At the 2016 Summer Olympics, Marija Ulitina defeated a former world number one, who reached that ranking in what year?
Context: Greg Van Avermaet (born 17 May 1985) is a Belgian professional road bicycle racer, currently riding for UCI WorldTeam BMC Racing Team .  He won the men's individual road race event at the 2016 Summer Olympics, and is the current world number one on both the UCI World Ranking and UCI World Tour since April 2017. Aliaksandr Mikalayevich Buikevich (Belarusian: Аляксандар Мікалаевіч Буйкевіч , Russian: Александр Буйкевич ; born 19 November 1984) is a Belarusian sabre fencer, European champion in 2008 and team silver medallist at the 2011 World Championships in Catania.  At the 2008 Summer Olympics, he reached the quarter-finals in the individual sabre, losing to Romania's Mihai Covaliu, while the Belarusian sabre team also reached the quarter-finals.  At the 2012 Summer Olympics, he competed in the men's sabre, but was defeated in the table of 16 by Romania's Rareș Dumitrescu.  The Belarusian team again reached the quarter-finals.  Aliaksandr qualified for the 2016 Summer Olympics in Rio de Janeiro as the only Belarusian fencer.  In men's sabre in the table of 32 he defeated Joseph Polossifakis of Canada.  He could not advance to the quarter-finals as in the table of 16 he lost to the eventual winner Áron Szilágyi of Hungary, who claimed his second consecutive gold medal at the Olympics individual men's sabre.  Aliaksandr finished 12th in the event. Marija Ulitina (born 5 November 1991) is a badminton player from Ukraine and the National Champion of Ukraine.  She represented Ukraine in the 2016 Summer Olympics and proceeded to the knockout round after defeating the former world number one Saina Nehwal of India and Lohaynny Vicente of Brazil in the group stage. Ramadan Darwish (born 29 January 1988 in Gharbia, Egypt) is an Egyptian judoka.  Ramadan Darwish won a bronze medal at the 2009 World Championships in Rotterdam -100 kg.  He is a multiple-time African Champion and won Grand Prix in Qingdao (2009), Tashkent (2014 and Budapest in 2015.  In 2016 he won gold at the Euro Open in Sofia.  He was IJF world number 2 in 2009.  He competed at the 2012 Summer Olympics in the -100 kg event and at the 2016 Summer Olympics in the same event.  He was much more successful in 2016, reaching the quarterfinals by beating Dominic Dugasse in his first match and José Armenteros in the last 16 before losing to Elmar Gasimov.  Because Gasimov reached the final, Darwish entered the repechage, where he lost to Karl-Richard Frey. Emmanuel "Emma" Lucenti (born November 23, 1984) is a judoka from Argentina.  He competed at the 2008, 2012 and 2016 Summer Olympics in the men's half-middleweight (-81 kg).  At the 2008 Summer Olympics, he lost in second round to Euan Burton.  At the 2012 Summer Olympics, he reached the quarter-finals, where he lost to Kim Jae-bum.  As Kim continued on to the gold medal match, Lucenti took part in the bronze medal repechage, where he lost in the first round to Antoine Valois-Fortier.  At the 2016 Summer Olympics, Lucenti was once again eliminated by Valois-Fortier, this time in the third round. Dana Whitney Vollmer (born November 13, 1987) is an American competition swimmer, Olympic gold medalist, and former world record-holder.  At the 2004 Summer Olympics, she won a gold medal as a member of the winning United States team in the 4×200-meter freestyle relay that set the world record in the event.  Eight years later at the 2012 Summer Olympics, Vollmer set the world record on her way to the gold medal in the 100-meter butterfly, and also won golds in the 4×100-meter medley relay and 4×200-meter freestyle relay.  She won three medals at the 2016 Summer Olympics in Rio de Janeiro. Saina Nehwal (   ; born 17 March 1990) is an Indian professional badminton singles player.  She is one of the greatest players of her time.  Nehwal, the former world no. 1 has won over twenty one international titles, which include ten Superseries titles.  Although she reached to the world no. 2 ranking in 2009, it was only in 2015 that she was able to attain the world no. 1 ranking.  And thereby becoming the only female player from India and overall the second Indian player – after Prakash Padukone – to achieve this feat.  She has represented India three times in the Olympics, winning bronze medal in her second appearance. Ki Bo-Bae (Hangul: 기보배; ] or ] ] ; born February 20, 1988 in Anyang, Gyeonggi Province) is a South Korean archer.  She took up archery in fourth grade at primary school as archery was offered as a school sport, and she now competes for the South Korean national team.  In 2011, Ki became the ninth woman to achieve the world number one ranking in the women's individual recurve rankings.  She won Olympic gold in both the team and individual archery events at the 2012 Summer Olympics.  Ki earned her third Olympic gold medal as a member of the gold medal winning South Korean women's archery team at the 2016 Summer Olympics.  In the women's individual event at the 2016 Summer Olympics, she won the bronze medal.  In 2016, she ranked as world number 4. The Olympic Training Center (Portuguese: "Centro Olímpico de Treinamento" , COT) is a sports training facility in Barra da Tijuca, Brazil that opened after the 2016 Summer Olympics and 2016 Summer Paralympics.  The centre uses six venues used in the 2016 games in addition to a number of new facilities created in the Barra Olympic Park footprint.  The centre became a campus of training facilities for Olympic and Paralympic athletes at the site of the former Nelson Piquet International Autodrome - Jacarepaguá as a legacy of the 2016 Summer Olympics and 2016 Summer Paralympics. Kim Woo-jin (Hangul: 김우진; ] or ] ] ; born June 20, 1992) is a South Korean archer who has the current world number one ranking and is the current world record holder in men's individual recurve archery.  He is a student, and lives in Chungju.  He is right-handed, and uses 30 in arrows and a draw weight of 46 lbs .  At the 2016 Summer Olympics.  he won his first Olympic gold medal as a member of the South Korean men's archery team, who defeated the United States in the men's team archery final.
Answer: 2015