Description based on: Vol. 42 (fiscal years 1992, 1993, and 1994); title from caption (viewed June 12, 2000).
Latest issue consulted: Vol. 54 (fiscal years 2004-06) (viewed Nov. 8, 2007).
Some issues distributed to depository libraries in microfiche.
Test in HTML and Adobe Acrobat, 1995- ; and statistical tables in Lotus spreadsheet, 1992- .
Beginning with v. 50 (fiscal years 2000, 2001, and 2002) issued in online format only.