Question: Krzysztof Zimnoch holds a win over the boxer who has held the WBC heavyweight title since what year?

full_context: Document 1: Lamon Brewster: Lamon Tajuan Brewster (born June 5, 1973) is an American former professional boxer who competed from 1996 to 2010. He held the WBO heavyweight title from 2004 to 2006, and is best known for scoring an upset knockout victory over Wladimir Klitschko to win the vacant title. As an amateur, Brewster won the U.S. national championships in 1995, and a silver medal at that year's Pan American Games, both in the heavyweight division. Following his retirement from the sport in 2011, he became an entrepreneur and founded a consulting business.
Document 2: Krzysztof Zimnoch: Krzysztof Zimnoch (born September 6, 1983) is a Polish professional heavyweight boxer affiliated to the Hetman Białystok Boxing Club. He holds an amateur win over current WBC heavyweight champion Deontay Wilder.
Document 3: Oleksandr Usyk: Oleksandr Oleksandrovych Usyk (Ukrainian: Олекса́ндр Олекса́ндрович У́сик ) is a Ukrainian professional boxer who has held the WBO junior heavyweight title since 2016. As of May 2017 he is ranked as the world's best in the division by "The Ring" magazine, the Transnational Boxing Rankings Board, and BoxRec. As an amateur, Usyk won gold medals at the 2011 World Championships and 2012 Olympics, both in the heavyweight division.
Document 4: Roy Jones Jr.: Roy Levesta Jones Jr. (born January 16, 1969) is an American professional boxer, boxing commentator, boxing trainer, rapper, and actor who holds dual American and Russian citizenship. He is a six-time former world champion in four weight classes, having held titles at middleweight, super middleweight, light heavyweight, and heavyweight; and is the only boxer in history to start his professional career at light middleweight and go on to win a heavyweight title. As an amateur he represented the United States at the 1988 Summer Olympics, winning a silver medal in the light middleweight division.
Document 5: Wladimir Klitschko: Wladimir Wladimirowitsch Klitschko (born 25 March 1976) is a Ukrainian former professional boxer who competed from 1996 to 2017. He is a two-time world heavyweight champion, having held the WBA (Super), IBF and WBO titles, as well as the IBO, "Ring" magazine, and lineal titles. A strategic and intelligent boxer, Klitschko is considered to be one of the greatest heavyweight champions of all time. He was known for his exceptional knockout power, utilising a strong jab, straight right hand and left hook.
Document 6: Samuel Peter: Samuel Okon Peter (born September 6, 1980) is a Nigerian-American professional boxer who held the WBC heavyweight title in 2008. He rose to prominence in his early career following a string of knockout wins, at a time when the titles of the heavyweight division were largely fragmented. In March 2008, Peter won a portion of the world heavyweight championship by knocking out Oleg Maskaev to win the WBC title. In October, in what would be his only defense of the title, Peter lost to a returning Vitali Klitschko, who stopped him in eight rounds. Peter is known for his rivalry with the Klitschko brothers, having faced Wladimir twice (in 2005 and 2010) and Vitali once.
Document 7: Tomasz Adamek: Tomasz Adamek (] ; born 1 December 1976) is a Polish professional boxer. He is a former two-weight world champion, having held the WBC light heavyweight title from 2005 to 2007; and the unified IBF, "Ring" magazine, and lineal cruiserweight titles from 2008 to 2009. Additionally he has challenged once for the WBC heavyweight title in 2011. Adamek is the first Polish winner of both the "Muhammad Ali Giant Athlete Award", and the first Polish boxer to win a "Ring" title.
Document 8: Tyson Fury: Tyson Luke Fury (born 12 August 1988) is a British professional boxer. He has held the "Ring" magazine heavyweight title since 2015, after defeating long-reigning world champion Wladimir Klitschko. In the same fight, Fury also won the unified WBA (Super), IBF, WBO, IBO and lineal titles, with the victory earning him Fighter of the Year and Upset of the Year awards by "The Ring". Fury was subsequently stripped of the IBF title later that year for being unable to grant a fight against their mandatory challenger, Vyacheslav Glazkov, due to agreeing to a rematch with Klitschko. In 2016, Fury vacated the WBA, WBO, IBO, and lineal titles following an ongoing medical investigation and personal issues and two cancellations of the Klitschko rematch. In August 2016, Fury was ranked by BoxRec as the world's sixth best active boxer, pound for pound.
Document 9: Mike Tyson: Michael Gerard Tyson ( ; born June 30, 1966) is an American former professional boxer who competed from 1985 to 2005. He reigned as the undisputed world heavyweight champion and holds the record as the youngest boxer to win a heavyweight title at 20 years, 4 months and 22 days old. Tyson won his first 19 professional fights by knockout, 12 of them in the first round. He won the WBC title in 1986 after stopping Trevor Berbick in two rounds, and added the WBA and IBF titles after defeating James Smith and Tony Tucker in 1987. This made Tyson the first heavyweight boxer to simultaneously hold the WBA, WBC and IBF titles, and the only heavyweight to successively unify them.
Document 10: Deontay Wilder: Deontay Leshun Wilder (born October 22, 1985) is an American professional boxer. He has held the WBC heavyweight title since 2015, and in doing so became the first American world heavyweight champion in nine years, which was the longest period of time in boxing history without an American heavyweight champion. As an amateur he won a bronze medal in the heavyweight division at the 2008 Olympics. This led to his nickname of "The Bronze Bomber", which Wilder coined after Joe Louis, who was known by the nickname of "The Brown Bomber".
Document 11: Klitschko brothers: Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), collectively known as the Klitschko brothers are Ukrainian heavyweight boxers. During their peak years from 2004 until 2015, the Klitschko brothers were considered the most dominant heavyweight champions of their era, and amongst the most successful champions in boxing history. After the retirement of boxing legend Lennox Lewis, the Klitschko brothers held all heavyweight boxing world titles. Known for their exceptionally large frames and robotic boxing styles, the Klitschko brothers developed a style that utilized their athleticism and using their reach to break down opponents.
Document 12: Charles Manyuchi: Charles Manyuchi is a Zimbabwean professional boxer who is the WBC, international welterweight champion since March 2014. In November 2014, he successfully defended his WBC crown in a Lusaka, Zambia fight against an opponent from Colombia. In 2014 he was awarded the Zimbabwe's Sportsperson of the year accolade. In July 2015 against an Italian boxer in Friuli-Venezia Giulia, he defended his crown successfully.In 2017 saw the fall of great man who was bound for glory and wider recognition internationally when he lost his title to Quadratilo from Singapore in what was referred as a huge upset in the boxing world especially to the fans back home. Coming back home,he received unwelcome remarks and comments from many fans but he however had support from government claiming to sue those who continued to attack him. The are currently plans to have a rematch.
Document 13: David Haye: David Deron Haye (born 13 October 1980) is a British professional boxer who has held world titles in two weight classes. He is the first British boxer to reach the final of the World Amateur Boxing Championships, where he won a silver medal in 2001. As a professional he became the first British boxer to become a unified cruiserweight world champion in 2008, winning three of the four major world titles, as well as the "Ring" magazine and lineal titles. In the same year he moved up to heavyweight, and became the WBA champion in 2009 after defeating Nikolai Valuev, who had a world record 9 in height and 99 lb weight advantage on Haye.
Document 14: Andrzej Fonfara: Andrzej Fonfara (born 4 November 1987) is a Polish professional boxer who held the IBO light heavyweight title from 2012 to 2013. He currently resides in Chicago, the city with the third largest Polish population in the world behind Warsaw and New York City.
Document 15: Dariusz Michalczewski: Dariusz Michalczewski (born 5 May 1968) is a Polish-German former professional boxer who competed from 1991 to 2005. He is a two-weight world champion, having held multiple world titles at light-heavyweight, including the WBO title from 1994 to 2003; the unified WBA, IBF, and lineal titles in 1997; and the WBO junior-heavyweight title from 1994 to 1995.
ground_truth: 2015