Question: What year was the first component of the space station which Cygnus CRS OA-6 completed 5 flights to launched into orbit?

Context articles: Cygnus CRS OA-9E
Cygnus CRS OA-4
Cygnus CRS OA-5
Cygnus CRS OA-6
Cygnus CRS Orb-2
Cygnus CRS OA-8E
International Space Station
Cygnus CRS OA-11
Cygnus CRS OA-10E
Cygnus CRS OA-7

Cygnus CRS OA-9E, also known as Orbital Sciences CRS Flight 9E, is the tenth planned flight of the Orbital ATK unmanned resupply spacecraft Cygnus and its ninth flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation System (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.
Cygnus CRS OA-4, also known as Orbital Sciences CRS Flight 4 was the fourth successful flight of the Orbital ATK uncrewed resupply spacecraft Cygnus and its third flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 With the Antares rocket undergoing a redesign following its failure during the Orb-3 launch, OA-4 was launched by an Atlas V rocket.
 Following three launch delays due to inclement weather beginning on 3 December 2015, OA-4 was launched at 21:44 UTC on 6 December 2015.
 With a liftoff weight of 16517 lb , OA-4 became the heaviest payload ever launched on an Atlas V.
 The spacecraft rendezvoused with and was berthed to the ISS on 9 December 2015.
 It was released on 19 February 2016 after 72 days at the station.
 Deorbit occurred on 20 February at approximately 16:00 UTC.
Cygnus CRS OA-5, also known as Orbital Sciences CRS Flight 5, is the seventh planned flight of the Orbital Sciences' unmanned resupply spacecraft Cygnus and its sixth flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation System (COTS) program, Orbital designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.
Cygnus CRS OA-6, also known as Orbital Sciences CRS Flight 6, is the sixth flight of the Orbital ATK unmanned resupply spacecraft Cygnus and its fifth flight to the International Space Station under the Commercial Resupply Services contract with NASA.
Cygnus CRS Orb-2, also known as Orbital Sciences CRS Flight 2, was the third flight of the Orbital Sciences' unmanned resupply spacecraft Cygnus, its third flight to the International Space Station, and the fourth launch of the company's Antares launch vehicle.
 The mission launched from the Mid-Atlantic Regional Spaceport on 13 July 2014.
Cygnus CRS OA-8E, also known as Orbital Sciences CRS Flight 8E, is the ninth planned flight of the Orbital ATK unmanned resupply spacecraft Cygnus and its eighth flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation System (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.
The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit.
 Its first component launched into orbit in 1998, and the ISS is now the largest human-made body in low Earth orbit and can often be seen with the naked eye from Earth.
 The ISS consists of pressurised modules, external trusses, solar arrays, and other components.
 ISS components have been launched by Russian Proton and Soyuz rockets, and American Space Shuttles.
Cygnus CRS OA-11, also known as OrbitalATK CRS Flight 11, is the twelfth planned flight of the Orbital ATK' unmanned resupply spacecraft Cygnus and its eleventh flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation System (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.
Cygnus CRS OA-10E, also known as Orbital Sciences CRS Flight 10E, is the eleventh planned flight of the Orbital ATK' unmanned resupply spacecraft Cygnus and its tenth flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation System (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.
Cygnus CRS OA-7, also known as Orbital Sciences CRS Flight 7, is the eighth flight of the Orbital ATK unmanned resupply spacecraft Cygnus and its seventh flight to the International Space Station under the Commercial Resupply Services contract with NASA.
 Orbital and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS).
 Under the Commercial Orbital Transportation Services (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.