Question: Genki Sudo holds a notable win over an American mixed martial artist who has been a professional competitor since what year?
Context: Genki Sudo (須藤 元気 , Sudō Genki , born March 8, 1978 in Kōtō, Tokyo, Japan) is a Japanese singer, composer, choreographer, actor, professional calligrapher and author.  He is the producer, director, and former lead vocalist of the music group World Order, which is known for their techno music style and highly synchronised robotic choreography.  Sudo is a retired mixed martial artist and a kickboxer who, until December 31, 2006 competed in the Japanese fighting organization HERO'S and before that, the Ultimate Fighting Championship and Pancrase.  He is known for his elaborate ring entrances and unorthodox fighting style.  Over his career he holds notable wins over Nate Marquardt, Eric "Butterbean" Esch, Mike Brown, Kazuyuki Miyata, Hiroyuki Takaya, Damacio Page and Ramon Dekkers. Patrick "Pat" Healy (born July 20, 1983) is an American professional mixed martial artist currently competing in the Lightweight division of Titan FC.  A professional competitor since 2001, Healy has also formerly competed for the UFC, Strikeforce, the WEC, the IFL, the MFC, King of the Cage, ACB and Shark Fights.  His twin brother, Ryan, is also a professional mixed martial artist. World Order (stylized as WORLD ORDER) is a Japanese band formed by Genki Sudo following his retirement from mixed martial arts.  The band is best known for their choreographed robotic dance performances in public places.  As of September 2017, World Order's YouTube channel has over 95 million views. Stephanie Eggink (born July 12, 1988) is an American mixed martial artist, who currently competes in the Strawweight division of the all-female promotion Invicta FC.  A professional competitor since 2011, Eggink holds a record of 4–3, and is the former XFC Strawweight Champion. Steven Scott Siler (born February 15, 1987) is an American mixed martial artist currently competing in the Featherweight division of Titan FC.  A professional competitor since 2005, he formerly competed for the UFC and was a competitor on Spike TV's . Nathan Joel "Nate" Marquardt (born April 20, 1979) is an American mixed martial artist competing in the middleweight division of the Ultimate Fighting Championship.  A professional competitor since 1999, he is a former Strikeforce Welterweight Champion and a three-time Pancrase Middleweight Champion. Kenichi Yamamoto (山本 喧一 , Yamamoto Ken'ichi ) is a Japanese mixed martial artist and professional wrestler.  Known for his pro wrestling career in UWF International, Yamamoto also competed against some of the best MMA fighters of his era in RINGS, Pride and the UFC, taking on Kevin Randleman, Genki Sudo and Pat Miletich, among others. Jared Rosholt (born August 4, 1986) is an American mixed martial artist currently competing in the Heavyweight division of the World Series of Fighting.  A professional competitor since 2011, Rosholt has also competed for the UFC, Titan FC, and Legacy FC.  He is the younger brother of former mixed martial artist Jake Rosholt. Ian James Schaffa (born as "Ian James Schaffer" on 23 January 1978) is an Australian professional mixed martial artist, kickboxer and boxer.  He has fought for XFC, K-1, S-Cup, World Victory Road, and Shooto promotions.  Schaffa is most notable for his intense bout with UFC fighter Kid Yamamoto and holds a notable K-1 kickboxing KO win over Japanese superstar Genki Sudo and Japanese kickboxing champion Keiji Ozaki. Norifumi "Kid" Yamamoto (山本徳郁 , Yamamoto Norifumi , born March 15, 1977) is a Japanese mixed martial artist and kickboxer who competes in the Bantamweight division of the UFC.  He quickly gained popularity in the Shooto organization due to his aggressive, well-rounded style and controversial persona.  He moved on to K-1 HERO'S, where he became the K-1 HERO's 2005 Middleweight Grand Prix Tournament Champion in December, 2005 after defeating Genki Sudo via a controversial TKO due to punches.
Answer: 1999