Share buyback programs 2023 UNIVERSAL REGISTRATION DOCUMENT PAGES 381 to 382 2022 UNIVERSAL REGISTRATION DOCUMENT PAGES 377 TO 378 2021 UNIVERSAL REGISTRATION DOCUMENT Pages 344 to 345 2020 UNIVERSAL REGISTRATION DOCUMENT Pages 354 to 355 AMENDMENT TO THE 2019 UNIVERSAL REGISTRATION DOCUMENT 2019 UNIVERSAL REGISTRATION DOCUMENT Pages 348 to 349 2018 Reference document Pages 314 to 315 2017 Reference document Pages 293 to 294 2016 Reference Document Pages 296 TO 297 2015 Reference document Pages 294 to 295 2014 Reference document pages 281 TO 282 Update of the 2013 Reference document 2013 Reference document pages 257 to 260 2012 Reference document pages 227 to 230 2011 Reference document Chapter 21.1.4 2010 Reference document chapter 21.1.4 2009 Reference document chapter 21.1.4 2008 Reference document chapter 21.1.4 2007 Reference document Pages 275 TO 277