Historical clue formulations

• Resident with monthly payments — 2024-09-17
• Possible source of monthly income — 2022-09-17
• One in town for the summer, say — 2016-01-02
• Thrifty customer, e.g. — 2012-06-23
• Lessee — 2008-10-19
• Thrifty customer? — 2006-03-17
• Letter's need — 2005-07-30
• One who deals with letters — 2004-11-06
• Flat person — 2003-12-28
• Tenant — 2002-05-02
• Flat dweller — 1997-05-29
• One in a flat — 1994-12-03