Here is the most recent Google search by volume for depression. The graph below shows search volume decreasing between 2005 and 2012.
A SFgate.com Docs warn about Facebook use and teen depression
B ABC.net.au: Germen goalkeeper suffered from depression
C Newsday: G20 action necessary to prevent global economic depression
D Reuters UK: Alcohol abuse may lead to depression
F Reuters UK: Mice overcome fee and depression