Historical clue formulations

• Erode — 2019-07-17
• Use part of — 2017-10-22
• Part of drain — 2010-04-01
• Take away from, as profits — 2009-10-26
• Deplete — 2009-03-13
• Erode — 2005-08-17
• Erode — 2003-12-07
• Destroy gradually — 2001-11-03
• Chip away at — 2001-06-01
• Erode — 2000-12-16
• Corrode — 2000-03-11
• Erode — 1998-12-04
• Deplete — 1998-10-23
• Erode — 1996-10-30
• Gradually destroy — 1996-10-05
• Gnaw at corrosively — 1996-02-19
• Corrode — 1995-07-23