These data are released at the first of each year. The exact date and time may be obtained by calling (202) 452-3206.
This site has G.5A releases for the following date(s):

January 2, 2008 January 3, 2007 January 3, 2006 January 3, 2005 January 2, 2004 January 6, 2003 January 2, 2002 January 9, 2001 January 3, 2000 January 4, 1999 January 5, 1998 January 7, 1997	Current release

Statistical releases