Sorry for the dumb thread title. It is subject to change, deletion, merging, or archiving.
Purely unnoficial, and keeping in mind that the official year of release doesn't always correlate to when King wrote or actually signed the book/story/guitar/portfolio, etc. 2013 has been a remarkable year for King, and a very expensive year for King Collectors

Here is a rough count of King S/L's by year:

1980-1
1981-2
1982-4
1983-4 (Cotw Portfolio)
1984-2
1985-1
1986-0 (Ouch!)
1987-2
1988-5 (DTI Audio, Letters From Hell)
1989-4 (DTII Audio)
1990-4 (Rainy Season Print)
1991-4 (Signatures)
1992-1
1993-1
1994-3 (Insomnia Portfolio)
1995-2 (Betts re-binds House Next Door)
1996-5
1997-3 (Cujo Guitar)
1998-3
1999-1
2000-2
2001-0 (Ouch!)
2002-2
2003-2
2004-5 (Does TGWLTG really count?)
2005-2
2006-1
2007-4
2008-0 (Ouch!)
2009-4
2010-6
2011-7
2012-5
2013-8
2014-?