Percentage decrease in visitors to US national parks between 1997 and 2006:

13.5
60 million people visited American national parks in 2006, down from 69.4 million in 1997.
Source: USA Today, 8/9/2007
Website: http://www.usatoday.com/news/snapshot.htm?section=L&label=2007-08-09-simpsons

 
   
  Number of the 24 annual vacation days allotted to British workers that are actually used:

21

Source: The New York Times, 6/2/2007

 
   
  Number of the 26 allotted annual vacation days used by the average German worker:

25

Source: The New York Times, 6/2/2007

 
   
  Number of the 14 annual allotted vacation days the average American actually uses:

11

Source: The New York Times, 6/2/2007