The problem with tracking those numbers with a trade script is that the script can't identify unique visitors without cookies. While the trade script can't accurately count non-cookie visitors it can track outgoing clicks by non-cookie visitors. Assuming the average clicks per visitor are the same for both cookie and non-cookie traffic you can then extrapolate based on total clicks. If that assumption holds true, then no cookie traffic on my largest TGP runs at about 3.5%.
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