Question: Until which year did this Polish professional boxer who lost to Joe Smith Jr. in 2016 in a knockout victory hold the IBO light heavyweight title?

full_context: Document 1: 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 2: Marcin Held: Marcin Held (born January 18, 1992) is a Polish mixed martial artist currently competing in the Lightweight division of the Ultimate Fighting Championship. A professional MMA competitor since 2008, Held has competed frequently in his home country of Poland and is highly touted by the media, often being regarded as "the prodigy of Polish MMA". He fought in Bellator MMA from 2010 to 2016, challenging for the Bellator Lightweight Championship in 2015.
Document 3: 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 4: 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 5: Liam Smith (boxer): Liam Smith (born 27 July 1988) is a British professional boxer. He held the WBO light-middleweight title from 2015 to 2016, having previously held the Commonwealth light-middleweight title from 2012 to 2013, and the British light-middleweight title from 2013 to 2015. Liam is the younger brother of Paul Smith and Stephen Smith, and the older brother of Callum Smith; all of whom are also professional boxers.
Document 6: Joanna Jędrzejczyk: Joanna Jędrzejczyk (] ; born August 18, 1987) is a Polish mixed martial artist and former Muay Thai kickboxer who competes in the women's strawweight division of the Ultimate Fighting Championship. She is the current UFC Women's Strawweight Champion and the third European (and only Polish) champion in UFC history after Bas Rutten in 1999 and Andrei Arlovski in 2005. As of May 2017, she is the consensus #1 female strawweight, and #1 pound-for-pound female MMA fighter in the world. She is also currently the #8 pound-for-pound fighter in the UFC mixed gender rankings, making her the top female on the list.
Document 7: Joe Smith Jr.: Joe Smith Jr. (born September 20, 1989) is an American professional boxer who held the regional WBC International light heavyweight title from 2016 to 2017. He rose to prominence in 2016 by scoring an upset knockout victory over Andrzej Fonfara, and later becoming the first boxer to score a stoppage victory over former world champion Bernard Hopkins, who retired after their fight.
Document 8: 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 9: 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 10: Joe Hipp: Joe "The Boss" Hipp (born December 7, 1962) is a retired professional Native American heavyweight boxer. A member of the Blackfeet Tribe, he became the first Native American to challenge for a world heavyweight boxing championship on August 19, 1995 when he fought WBA champion Bruce Seldon at the MGM Grand Garden Arena. In May 2009, he was inducted into the American Indian Athletic Hall of Fame.
Document 11: Andre Ward: Andre Michael Ward (born February 23, 1984) is an American former professional boxer who competed from 2004 to 2017. He retired with an undefeated record and held eight world titles in two weight classes, including the unified WBA (Super), WBC, "Ring" magazine, and lineal super middleweight titles between 2009 and 2015; and the unified WBA (Undisputed), IBF, WBO, and "Ring" light heavyweight titles between 2016 and 2017. During his reign as light heavyweight champion, Ward was ranked as the world's best active boxer, pound for pound, by "The Ring" magazine and the Transnational Boxing Rankings Board (TBRB), as well as the world's best active boxer in the division by "The Ring", the TBRB, and BoxRec.
Document 12: 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 13: 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.
Document 14: 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 15: Paul Smith (boxer): Paul Smith Jr. (born 6 October 1982) is a British professional boxer. He held the English middleweight title in 2008; the British super-middleweight title twice between 2009 and 2014; and has challenged three times for a super-middleweight world title.
ground_truth: 2013