I spent some time looking around the Mike's Amazing World of DC site. He has a section on there tabulating the number of issues DC published each year since 1935.

People wonder why single books aren't getting the sales they used to? I'd say it's partly due to the amount of competition. Similar to why one network isn't getting the ratings it once did when you figure a network is now competing with 300+ other networks as opposed to just three.

In 1980 DC published 335 issues. In 2005 they published 1,279!

http://www.dcindexes.com/database/report-summary.php

I love his comic cover time machine. You can sort by month and look at every DC comic that came out that month.

Incidentally, that's the way I collect back issues now. I hone on a specific year, and sort my back issues (no bags! commando style!) by month. Right now I am most focused on 1980.

Trevor has done that. Around a year or so ago he was posting his version of the Diddy weekly comics, but they were comics from 20 years ago. Some days I am tempted to do the same. In fact I did that this weekend ordering an old Plastic Man I used to have and an issue of Action from the mid-70s.