Guy "Arc Angel" Waters ( (1964--) 25 1964 (age (2017)-(1964)-((11)<(01)or(11)==(01)and(30)<(25)) ) ) is an Australian professional welter/light middle/middle/super middle/light heavy/cruiserweight boxer of the 1980s, 1990s and 2000s who won the New South Wales State (Australia) light heavyweight title, Australian light heavyweight title, Oriental and Pacific Boxing Federation (OPBF) light heavyweight title, Australasian Light Heavyweight Title, World Boxing Federation (WBF) light heavyweight title, International Boxing Federation (IBF) Pan Pacific super middleweight title, Oriental and Pacific Boxing Federation (OPBF) super middleweight title, and Commonwealth light heavyweight title, and was a challenger for the WBC light heavyweight title against Dennis Andries, World Boxing Association (WBA) World light heavyweight title against Virgil Hill, World Boxing Council (WBC) cruiserweight title against Juan Carlos Gómez, and Commonwealth super middleweight title against David Starie, his professional fighting weight varied from 167+1/2 lb , i.e. super middleweight to 185+1/4 lb , i.e. cruiserweight.
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.
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".
Daniel Peter "Danny" Williams (born 13 July 1973) is a British professional boxer.
 A veteran of the sport since 1995, he held the British heavyweight title twice between 2000 and 2010, and the Commonwealth heavyweight title twice between 1999 and 2006.
 Williams is best known for scoring an upset knockout victory against Mike Tyson in 2004, which earned him a mandatory WBC heavyweight title opportunity.
 In the same year, he challenged then-reigning champion Vitali Klitschko, but was stopped in eight rounds.
Franklin Roy "Frank" Bruno, {'1': ", '2': ", '3': ", '4': "} (born 16 November 1961) is a British former professional boxer who competed from 1982 to 1996.
 Bruno had a highly publicised and extremely eventful career.
 The pinnacle of his boxing career was winning the WBC heavyweight title, in what was his fourth world championship challenge.
 He also held the European heavyweight title earlier in his career.
 Bruno was one of the most well-loved and recognisable boxers in British history, and faced multiple top-rated heavyweights during his career including two bouts with Mike Tyson and a domestic clash against Lennox Lewis.
 He won the WBC title in 1995 after defeating Oliver McCall at a packed Wembley Stadium.
 Bruno was known for his excellent punching power: he won 40 of his 45 bouts and 38 by knockout, giving him a 95% knockout rate from the fights he won; his overall knockout percentage is 84.44%.
 Like Henry Cooper before him, Bruno has remained a popular celebrity with the British public following his retirement from boxing.
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.
Steve Aczel ( (1954--) 08 1954 (age (2017)-(1954)-((11)<(09)or(11)==(09)and(30)<(08)) ) ) born in Budapest is an Australian professional light heavy/cruiser/heavyweight boxer of the 1980s, '90s and 2000s who won the Australasian light heavyweight title, Australian light heavyweight title, Australian heavyweight title, Oriental and Pacific Boxing Federation (OPBF) heavyweight title, Queensland State (Australia) heavyweight title, and Commonwealth light heavyweight title, drew with Maile Haumona for the South Pacific heavyweight title, and was a challenger for the Australian cruiserweight title against Tony Mundine, and Commonwealth cruiserweight title against Stewart Lithgo, his professional fighting weight varied from 172 lb , i.e. light heavyweight to 203+1/2 lb , i.e. heavyweight.
 He was inducted into the Australian National Boxing Hall of Fame in 2011.
Neil "Simmo" Simpson ( (1974--) 23 1974 (age (2017)-(1974)-((11)<(01)or(11)==(01)and(30)<(23)) ) ) born in London, now based in Coventry, is an English professional light heavy/cruiser/heavyweight boxer of the 1990s and 2000s, who won the British Boxing Board of Control (BBBofC) Midlands Area light heavyweight title, BBBofC British light heavyweight title, British Masters Cruiserweight title, and Commonwealth light heavyweight title, and was a challenger for the International Boxing Organization (IBO) Inter-Continental light heavyweight title against Darren Corbett, European Boxing Union (EBU) light heavyweight title against Yawe Davis, World Boxing Union (WBU) light heavyweight title against Tony Oakey, and BBBofC British light heavyweight title against Peter Oboh, his professional fighting weight varied from 169 lb , i.e. light heavyweight to 216 lb , i.e. heavyweight.
Crawford "Chilling" Ashley (born Gary Crawford, 20 May 1964 in Leeds is an English professional super middle/light heavy/cruiser/heavyweight boxer of the 1980s, '90s and 2000s, who won the British Boxing Board of Control (BBBofC) Central Area light heavyweight title, BBBofC British light heavyweight title, European Boxing Union (EBU) light heavyweight title (twice), and Commonwealth light heavyweight title (twice), drew with Yawe Davis for the vacant European Boxing Union (EBU) light heavyweight title, and was a challenger for the European Boxing Union (EBU) light heavyweight title against Graciano Rocchigiani, World Boxing Association (WBA) World super middleweight title against Michael Nunn, World Boxing Association (WBA) World light heavyweight title against Virgil Hill, and World Boxing Union (WBU) cruiserweight title against Sebastiaan Rothmann, his professional fighting weight varied from 163 lb , i.e. super middleweight to 211 lb , i.e. heavyweight.
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.

Question: Krzysztof Zimnoch holds a win over the boxer who has held the WBC heavyweight title since what year?
Answer: 2015