https://livesandlegaciesblog.org/2017/05/24/coffee-a-revolut... https://blog.publicgoods.com/a-brief-history-of-coffee-in-am...
Check on the section on WW2, "An average of 20 pounds of coffee were consumed a year per adult. ... This amount was cut in half to 10 pounds a year, as one pound of coffee was allotted to each person over 15 years old every five weeks."