I understand; I guess my question is about the absolute number of readers (not the ethnic/gender makeup).
While you don’t get demographic breakdowns by gender, age, race the following will offering you general sales numbers, and over time Comic Sales have been falling... A BIG book in the 90s might sell 200k+ a month.... now 100K is is about as big as they get.
http://www.comichron.com/monthlycomicssales.html
You’ll also see that in the 90s when Marvel tended to dominate the top 10 in sales, it now only has a few books there... DC holding most of the spots.
Marvel is in steep decline....