Question: In what year did the team that built the Lotus E21 begin to compete under the Lotus name?

Context articles: Lotus 16
Caterham Racing (GP2 team)
Lotus 32
Lotus 94T
Lotus E20
Lotus E21
Lotus 98T
Lotus 33
Lotus T128 (Formula One car)
Lotus F1

The Lotus 16 was the second single-seat racing car designed by Colin Chapman, and was built by his Lotus Cars manufacturing company for the Team Lotus racing squad.
 The Lotus 16 was constructed to compete in both the Formula One and Formula Two categories, and was the first Lotus car to be constructed for Formula One competition.
 Its design carried over many technological features of the first Lotus single-seater, the Lotus 12, as well as incorporating ideas which Chapman had been developing while working on the Vanwall racing cars.
 Indeed, such was the visual similarity between the Vanwall and Lotus 16 designs that the Lotus was often dubbed the ""mini Vanwall"" by the contemporary motor sport press.
 Although the Lotus 16 only scored five Formula One World Championship points in the three seasons during which it was used, its raw pace pointed the way for its more successful successors, the Lotus 18 and 21.
Caterham Racing, formerly EQ8 Caterham Racing and Caterham Team AirAsia was a motor racing team competing in the GP2 Series and GP2 Asia Series.
 It was created by Tony Fernandes, who was also responsible for the revival of the Lotus name in Formula 1 in 2010 with the creation of the Lotus Racing team.
 Team AirAsia was officially accepted to the GP2 Series grid on 21 September 2010, along with fellow debutants Carlin Motorsport, filling the gap left by the departures of Durango and DPR.
 The team made their debut at the first round of the 2010–11 GP2 Asia Series.
The Lotus 32 was a Formula 2 racing car built by Team Lotus in 1964.
 It was developed from the Lotus 27 Formula Junior model.
 Twelve cars were produced, four of which were run by Ron Harris Team Lotus, whose drivers included Jim Clark and Mike Spence.
 Spence won the 1964 Autocar British Formula 2 Championship while Clark was fourth in the Trophées de France Championship.
The Lotus 94T was a Formula One racing car used by Team Lotus in the second part of the 1983 Formula One season.
 The car was powered by the Renault Gordini EF1 V6 turbo engine, and ran on Pirelli tyres.
 The car was designed and built in only six weeks by incumbent designer Gérard Ducarouge, who was brought into the team by boss Peter Warr in an attempt to stave off the uncompetitiveness of the previous Lotus cars.
The Lotus E20 is a Formula One racing car designed and produced by the Enstone-based Lotus F1 Team for the 2012 Formula One season.
 The E20 was the twentieth Formula One car to be designed at Enstone since 1992, and was named in tribute to the contribution made by the facility and its personnel in their twenty-year history.
 The car was also the first from Enstone to carry the Lotus name, since the team ceased using the Renault name following their renaming from Lotus Renault GP at the end of 2011.
 The team continued to use Renault engines for the car.
 The car, which was launched by the team on its website on 5 February 2012, was driven by 2007 World Drivers' Champion Kimi Räikkönen and 2011 GP2 Series champion Romain Grosjean, both of whom returned to Formula One after a two-year absence.
The Lotus E21 is a Formula One racing car designed and built by the Lotus F1 team for use in the 2013 championship.
 The car was driven by 2007 World Champion Kimi Räikkönen and Romain Grosjean, both of whom remained with the team after competing in 2012.
 The E21 was the first of the 2013 season cars to be launched.
The Lotus 98T was a Formula One racecar designed by Gérard Ducarouge & Martin Ogilvie, and built by Team Lotus.
 It was made to compete during the 1986 Formula One season, and was a development of the Lotus 97T of 1985.
 Of the four chassis built, three were assigned to lead driver Ayrton Senna, now in his second year with Team Lotus, and one to team mate Johnny Dumfries.
The Lotus 33 was a Formula One car designed by Colin Chapman and Len Terry and built by Team Lotus.
 A development of the successful Lotus 25, in the hands of Jim Clark it won 5 World Championship Grands Prix in 1965, assisting Clark to his second World Championship.
The Lotus T128, known prior to its launch by its project number TL11, is a Formula One motor racing car designed by Mike Gascoyne for Team Lotus for use in the 2011 Formula One season.
 2011 saw the car abandon its Cosworth engine in favour of one developed by Renault.
 The T128 was launched online on 31 January 2011.
 Team Lotus retained an unchanged driver lineup in 2011, with 2010 drivers Heikki Kovalainen and Jarno Trulli racing the T128.
 It was confirmed that the team would start the season without the Kinetic Energy Recovery System, but senior figures suggested they would adopt it if the car proved successful, however the team continued for the rest of the 2011 season without KERS.
 The team changed from the Cosworth CA2010 engine used in 2010 to the Renault RS27 series, as well as exchanging a transmission developed by X-Trac to one built by Red Bull Technologies.
 The design of the T128 also incorporated a "bladed" rollbar similar to the one developed by Mercedes in 2010, but thicker and with sturdier air intakes to conform with FIA regulations.
Lotus F1 Team was a British Formula One racing team.
 The team competed under the Lotus name from 2012 until 2015, following the renaming of the former Renault team based at Enstone in Oxfordshire.
 The Lotus F1 Team was majority owned by Genii Capital.
 Lotus F1 was named after its branding partner Group Lotus.
 The team achieved a race victory and fourth position in the Formula One Constructors' World Championship in their first season under the Lotus title.
 The team was sold back to Renault on 18 December 2015, The Lotus F1 Team name was officially dropped on 3 February 2016, and announced that they would compete as Renault Sport Formula One Team.