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Visits to piracy websites have increased 12% in the past four years
(www.fastcompany.com)
This is a most excellent place for technology news and articles.
I was curious too and checked the article but skimming it, instead of a total, I found this:
With the study being done by a clearly biased person/group and that large omission, I think it's fair to assume that the % of total web traffic going to pirates might not have gone up all that much, maybe it even went down.