who are the x factor global judges?
['Simon Cowell: 2004 to present.', 'Robbie Williams & Ayda Field: 2018.', 'Sharon Osbourne: 2004 to 2007, 2013, 2016.', 'Louis Walsh: 2004 to 2018.', 'Nicole Scherzinger: 2012 to 2014, 2016, 2017.', 'Dannii Minogue: 2007 to 2011.', 'Cheryl: 2008 to 2011, 2014, 2015.']