In 2019, there were 18 WorldTour teams in total. Of these, 12 have been permanent fixtures in cycling’s top division through the whole decade: Ag2r La Mondiale, Astana, Deceuninck-Quick Step, EF Education First, Groupama-FDJ, Lotto Soudal, Movistar, Ineos, Jumbo-Visma, Katusha-Alpecin, Trek-Segafredo and UAE Emirates. Some of these are complicated. EF, for example, were Garmin in 2010, absorbed the Cervélo Test Team in 2011 and merged with Cannondale in 2015. RadioShack 2010 merged with Leopard-Trek at the end of 2011 and begat what eventually became Trek-Segafredo. In other cases, teams have changed sponsors - Sky to Ineos, Caisse d’Epargne to Movistar, Rabobank via Belkin and LottoNL to Jumbo-Visma. And some teams are exactly the same: Ag2r, Astana, Lotto…
In total, there have been 27 WorldTour teams this decade, with varying levels…