Data journalism by Daniel Dunford, John Walton, Will Dahlgreen, Ed Lowther, Christine Jeavans, Becky Dale, Maryam Ahmed, Wesley Stephenson and Alison Benjamin. Design by Debie Loizou, Prina Shah and Gerry Fletcher. Development by Marcos Gurgel, Scott Jarvis, Catriona Morrison, Becky Rush, Steven Connor, Toby Cox, Shilpa Saraf, Adam Allen and Sally Morales