Was about to make a similar comment.

Blizzard is celebrating WoW's 11th anniversary.

2004 - 2005 = 1 year

So...

1) 2004 - 2005
2) 2005 - 2006
3) 2006 - 2007
4) 2007 - 2008
5) 2008 - 2009
6) 2009 - 2010
7) 2010 - 2011
8) 2011 - 2012
9) 2012 - 2013
10) 2013 - 2014
11) 2014 - 2015
12) 2015 - Bankrupt b4 Legion?