Question: When was the stadium Wollongong Wolves Football Club plays at opened?

full_context: Document 1: Stadium Australia: Stadium Australia, commercially known as ANZ Stadium and formerly as Telstra Stadium, is a multi-purpose stadium located in the Sydney Olympic Park, in Sydney, Australia. The stadium, which in Australia is sometimes referred to as Sydney Olympic Stadium, Homebush Stadium or simply as the Olympic Stadium, was completed in March 1999 at a cost of A$690 million to host the 2000 Summer Olympics. The current chairman of the stadium's Advisory Board is Robert Webster. Every year since the stadium was built, the New South Wales rugby league team's home games in the State of Origin series have been played there. Also the stadium has since hosted the annual National Rugby League grand final. ANZ Stadium also hosted the 2003 Rugby World Cup finals and Bledisloe Cup matches, regular Sydney Swans and Greater Western Sydney Giants AFL matches, as well as international soccer matches featuring Australia's national team the Socceroos, and exhibition games by Sydney-based A-League team Sydney FC. The stadium also hosted the 2015 AFC Asian Cup final.
Document 2: Melbourne Rectangular Stadium: The Melbourne Rectangular Stadium, commercially known as AAMI Park, is an outdoor sports stadium on the site of Edwin Flack Field in the Sports and Entertainment Precinct in the Melbourne City Centre. The stadium's major tenants are NRL team Melbourne Storm, the Super Rugby team Melbourne Rebels, and the A-League teams Melbourne Victory FC and Melbourne City FC.
Document 3: Sydney Cricket Ground: The Sydney Cricket Ground (SCG) is a sports stadium in Sydney, Australia. It is used for Test, One Day International and Twenty20 cricket, as well as Australian rules football, rugby league football and rugby union. It is the home ground for the New South Wales Blues cricket team, the Sydney Sixers of the Big Bash League and the Sydney Swans Australian Football League club. It is owned and operated by the Sydney Cricket Ground Trust that also manages the Sydney Football Stadium located next door. Until the 44,000 seat Football Stadium opened in 1988, the Sydney Cricket Ground was the major rugby league venue in Sydney.
Document 4: Western Sydney Wanderers FC Reserves: Western Sydney Wanderers FC Reserves is an Australian semi-professional association football team based in the western region of Sydney, New South Wales. Founded in 2012, it is the reserve and youth team of Western Sydney Wanderers. The team currently plays in the National Premier Leagues NSW which is the second level of Australia's football pyramid and in the National Youth League.
Document 5: List of Wollongong Wolves FC seasons: Wollongong Wolves FC is an association football club based in Wollongong, Australia. The club was formed in 1980 as has competed at the highest tier of soccer in Australia. Currently, the club participates in the National Premier Leagues NSW competition, which is the second highest tier of soccer in Australia. The club has won one continental championship, two national championships and two state championships.
Document 6: Football South Coast: Football South Coast is a sport governing body and football (soccer) competition based in the Illawarra and South Coast regions of New South Wales. All competitions and football activity of Football South Coast is under control of Football New South Wales. The Illawarra Mercury Premier League is the top level of competition in this region. The second tier of football in the region involve two leagues, the Illawarra Credit Union District League and the Peoplecare District League. The final tier of football involves amateur and social players spread across four divisions and two masters competitions.
Document 7: Kirklees Stadium: Kirklees Stadium (known as the John Smith's Stadium due to sponsorship), is a multi-use sports stadium in Huddersfield in West Yorkshire, England. Since 1994, it has been the home ground of football club Huddersfield Town and rugby league side Huddersfield Giants, both of whom moved from Leeds Road.
Document 8: Sydney FC (W-League): Sydney FC, also known as Sydney FC W-League is a soccer club based in Sydney, New South Wales, Australia. It competes in the country's premier women's soccer competition, the W-League and has a direct affiliation with the men's A-League team Sydney FC.
Document 9: University of Wollongong Titans: The University of Wollongong Titans (or UOW Titans) is an Australian rugby league football team based in Wollongong. The club are a part of Country Rugby League and competes in the Illawarra Rugby League premiership. The club plays out of University Oval, Wollongong. The Titans wear red, navy and white jerseys. An earlier team from the University of Wollongong were nicknamed the "Books".
Document 10: Willows Sports Complex: The Willows Sports Complex, currently known as 1300SMILES Stadium through sponsorship, is a grass football stadium situated in Townsville, Queensland, Australia. It has been a predominantly rugby league ground as the home ground of the North Queensland Cowboys National Rugby League club. The ground has also been used for rugby union and soccer. From 2009 to 2011, A-League football club North Queensland Fury called it home. Since inception as a rugby league ground, the ground has had sponsored naming rights: Stockland Stadium (1995–97), Malanda Stadium (1998) and Dairy Farmers Stadium (1999–2013).
Document 11: Western Wolves FC: The Western Wolves Football Club is an association football club based in the western suburbs of Melbourne, Victoria, Australia.
Document 12: Bulli FC: Bulli FC, commonly known as Bulli Football Club are a semi-professional association football team based in Bulli, New South Wales. They compete in the Illawarra Premier League, and are considered one of the most successful teams in the competition having finished Premiers 4 times, the most recently in 2014. The team plays out of Balls Paddock, a small ground located at Woonona, just south of Bulli which was opened in 1988. Bulli FC has had several well known, high-profile players both play, and coach at the club including Socceroos players Adrian Alston, and Dean Heffernan. In addition to their Illawarra Premier League team, Bulli FC also fields junior teams and women's teams in local club competitions in Wollongong.
Document 13: National Premier Leagues NSW 2: The National Premier Leagues NSW 2 is an Australian semi-professional association football league comprising teams from New South Wales. The league sits at Level 2 on the New South Wales league system, behind the National Premier Leagues NSW, (Level 3 of the overall Australian league system). The competition is administered by Football NSW, the governing body of the sport in the southern region of the state (the northern region governed by Northern NSW Football). Prior to 2013, the league was formally known as the NSW Super League.
Document 14: Wollongong Wolves FC: Wollongong Wolves Football Club is an Australian semi-professional football club based in Wollongong, in the Illawarra region of New South Wales. The club currently competes in the National Premier Leagues NSW, the second-tier of football in Australia. The club plays its home games out of WIN Stadium. The club has been successful throughout their history winning one continental championship, two national championships and two state championships.
Document 15: Wollongong Showground: Wollongong Showground, known as WIN Stadium for sponsorship reasons, is a multi-purpose stadium located in Wollongong, Australia. The stadium was officially opened in 1911. From 1982 until 1998 it played host to every home match for the Illawarra Steelers NRL team, and is still the team's home ground in the lower grade competitions. It is now used as one home ground of the St George Illawarra Dragons rugby league side and Wollongong Wolves of the National Premier Leagues NSW.
ground_truth: 1911