Historical clue formulations

• It has no point — 2018-01-31
• The first parts of 17- and 22-Across are always this, the first part of 46-Across is sometimes this, and the first part of 55-Across is never this — 2016-02-10
• Figure — 2004-12-18
• Zero, e.g. — 2002-11-02
• It has no decimal point — 2000-11-14
• Round amount — 1999-07-15
• Whole thing? — 1998-04-23
• Whole thing — 1997-12-12
• Whole number — 1997-02-08
• Whole amount — 1994-02-09