According to this National Security Archive press release, more than 2.4 million FOIA requests have been filed since the law was signed on July 4, 1966 by President Lyndon Johnson, “at a yearly cost of just over $1 per citizen.” The Archive commemorates the importance of this law by publishing “an itemized list of 38 noteworthy news stories from the last 12 months that cited documents obtained through the Freedom of Information Act.”