What is the size of the self published books market in the us?

I am looking for data about the size of the self publishing market compared to traditional publishing. Also, what is the trend in this market? Is it growing compared to traditional publishing? What is happening in other places in the world?
ilan
Asked Mar 01, 2013
http://www.miamiherald.com/2012/11/11/3092294/self-publishing-industry-explodes.html
Rob
Answered Mar 01, 2013

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