Question: What is the birthyear of the figure skater who won a silver medal at the 1992 World Championships and was attacked by Tonya Harding?

Context articles: Tim Brown (figure skater)
Tonya Harding
I, Tonya
Mark Pepperday
Gillis Grafström
Regine Heitzer
Nancy Kerrigan
Ethel Muckelt
Kay Thomson
Alice Sue Claeys

Timothy Tuttle "Tim" Brown (July 24, 1938 – September 14, 1989) was an American former figure skater.
 He won the silver medal at the U.S. Figure Skating Championships four times and twice captured the silver at the World Figure Skating Championships.
 He also competed at the 1960 Winter Olympics.
 In 1961, he earned another berth to the World Championships but did not make the trip due to illness, a move that was ironically fortunate, as the entire U.S. Figure Skating team was killed en route to the competition when Sabena Flight 548 crashed near Brussels.
Tonya Maxene Harding (born November 12, 1970) is a former American figure skater.
 She was a two-time Olympian and a two-time Skate America Champion.
 In 1991, she won the U.S. Figure Skating Championships and placed second in the World Championships.
 Harding was the second woman (and the first American woman) to complete a triple axel jump in competition.
 In 1994, she was banned for life from the U.S. Figure Skating Association after pleading guilty to hindering the prosecution following the attack on fellow skater Nancy Kerrigan.
I, Tonya is a 2017 American biographical sports black comedy-drama film directed by Craig Gillespie and written by Steven Rogers.
 The film stars Margot Robbie as figure skater Tonya Harding, along with others including Sebastian Stan, Allison Janney, Paul Walter Hauser, Julianne Nicholson, Caitlin Carver, Bojana Novakovic and Bobby Cannavale.
Mark Pepperday is a British figure skater who currently works as a coach in Switzerland.
 As a competitive skater, he won the silver medal at the 1977 World Junior Figure Skating Championships.
 His highest placement at the European Figure Skating Championships was 14th, in 1981, and his highest placement at the World Figure Skating Championships was 20th in 1983.
 He currently coaches Sarah Meier and Moris Pfeifhofer, among others.
Gillis Emanuel Grafström (7 June 1893 – 14 April 1938) was a Swedish figure skater.
 He was born in Stockholm, Sweden.
 He won three successive Olympic gold medals in Men's Figure Skating (1920, 1924, 1928) as well as an Olympic silver medal in the same event in 1932, and three World Championships (1922, 1924, 1929).
 He and Eddie Eagan are the only athletes to have won a gold medal at both the Summer and Winter Olympic Games.
 Grafström has the further distinction of being the only person to have won an individual gold medal in both the Summer (1920) and Winter Olympics (1924, 1928), although Eagan remains the only one to have managed the feat in different disciplines.
 Grafstrom is one of the few athletes who have competed in both the Summer and Winter Olympic games.
Regine Heitzer (born 16 February 1944) is a retired Austrian figure skater.
 She competed at the 1960 and 1964 Winter Olympics and won a silver medal in the singles event in 1964.
 Between 1960 and 1965 she also won 11 medals at European and world championships.
 In 1967 she turned professional and skated for Vienna Ice Revue and Holiday on Ice.
 She retired in 1971 due to a knee injury and rarely danced since then – in 1979 she skated with Emmerich Danzer to promote the World Championships in Vienna.
Nancy Ann Kerrigan (born October 13, 1969) is an American former figure skater.
 She won bronze medals at the 1991 World Championships and 1992 Winter Olympics, and a silver medal at the 1992 World Championships, before becoming the 1993 US National Champion.
Ethel Muckelt (30 May 1885 – 13 December 1953) was a British figure skater who competed in singles and pairs.
 As a single skater, she won the bronze medal at the 1924 Winter Olympics.
 As a pair skater, she placed fifth at the 1920 Summer Olympics with Sydney Wallwork.
 With John Page, she won the silver medal at the 1924 World Figure Skating Championships and placed fourth at that year's Olympics.
Kay Thomson (born February 18, 1964) is a Canadian former figure skater who competed in ladies' singles.
 She is the 1981 Prize of Moscow News champion, the 1983 Skate Canada International silver medalist (behind that years Olympic and World Champion Katarina Witt), and a three-time Canadian national champion.
 Her rise to dominance of Canadian ladies figure skating was unexpected as young phenom Tracy Wainmann had been expected to dominate Canadian ladies skating throughout this quadrennial, and beyond, but Thomson dethroned Wainmann at the 1982 Canadian Championships, and was only challenged by rising future superstar Elizabeth Manley thereafter as Wainmann fell off the map for a few years with personal issues and a growth spurt.
 She represented Canada at the 1984 Winter Olympics in Sarajevo, placing 12th, and at three World Championships, achieving her best result, fifth, in 1984 (Ottawa).
 At this event she had perhaps her best shot ever of a world podium finish in a heavily weakened post Olympic field (missing amongst other Rosalynn Sumners, Tiffany Chin, Claudia Leistner, and Elena Vodorezova) and a respectable initial finish in compulsory figures which were never her strength, but a turn between her triple lutz-double toe combination in the short, and a miss on her triple flip in the long, was enough to keep her behind silver medalist Anna Kondrashova, bronze medalist Elaine Zayak, and 4th place finisher Kira Ivanova.
 The pro Canadian crowd however were not fully convinced, and booed the marks of each of Kondrashova, Ivanova, and young Japanese phenom Midori Ito (who was scored 4th best in the long program phase despite a fall and several glaring miscues), feeling Thomson and teammate Elizabeth Manley were unfairly scored.
 At the post event press conference Kondrashova would apologize to the fans for having not performed better, despite her silver medal.
Alice Sue Claeys (born February 24, 1975) is a former competitive figure skater.
 Representing Belgium, she won silver at the 1992 Skate Canada International and finished in the top ten at three ISU Championships — the 1992 World Junior Championships (4th), the 1992 World Championships (7th), and the 1993 European Championships (8th).