for each year there is an index for each month. Those years are freely available on the web. For years 1984 to 1998 and 2007 to 2012 you need like a $16/year subscription though. Each month's contains 40 statistics so it's a good source of material. Always is a number, percentage or a date perfect for Wits and Wagers.
Just click on Archive and choose a year between 1999 to 2006 and then click on a month then click HARPERS INDEX to get the data.
Here is Jan 1999
Here is Dec 2006 and a small sample so you get an idea
Amount a cable TV reporter paid a former Army interrogator to waterboard him in July: $800
Minutes into the waterboarding that a producer decided he had to stop it: 24
Number of incidences of torture on prime-time network TV shows from 2002 to 2005: 624
Number on shows the previous seven years: 110
Number of people the U.S. counterterrorism agent Jack Bauer personally killed last season on the TV show 24: 38
Percentage change from 2004 to 2005 in the number of criminal violations by U.S. military recruiters: +106
Number of private firms that have been hired since 2002 to recruit soldiers for the Army: 712
Average amount the firms are paid per recruit: $5,700
Number of Americans and Britons who now work in the IT industry in India: 30,000
Monthly cost for a U.S. student to receive unlimited online tutoring from a Bangalore-based “e-tutor”: $100
Minimum number of PlayStation 3s whose spare processing power will be used next year for biological research: 10,000