Timeline for all types of items produced by
Valve Corp.

Year	Items
2000	1
2001	1
2004	4
2005	3
2006	1
2007	2
2008	2
2009	2
2010	1
2011	4
2012	1
2013	1
2015	1

24 items with a valid date were considered for this timeline (100.00% of the total)