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For displaying ads with AdSense for content, publishers receive 68% of the amount Google collects from advertisers. For AdSense for search, publishers receive 51% of the amount collected from advertisers.
(*cough* You might want to redact the actual percentage from your post - its probably one of the things TOS prevents us sharing...)
Yep, I'm seeing it too - well spotted.
AdSense for content publishers, who make up the vast majority of our AdSense publishers, earn a 68% revenue share worldwide. This means we pay 68% of the revenue that we collect from advertisers for AdSense for content ads that appear on your sites.
Since launching AdSense for content in 2003, this revenue share has never changed.