Historical clue formulations

• Under discussion — 2018-05-29
• Up for debate — 2017-10-07
• Up for discussion — 2012-03-05
• Under debate — 2011-05-29
• Being debated — 2010-08-15
• Disputed — 2009-07-19
• Being debated — 2008-09-21
• Yet undecided — 2005-08-26
• Under debate — 2003-02-10
• Under discussion — 2002-07-12
• Under debate — 1999-07-14