Google (NSDQ: GOOG), which has faced criticism from publishers that its AdSense program is not transparent enough, has finally provided a break-down of the percentages of AdSense revenue it shares. In a blog post, Google says that, in general, publishers who put AdSense ads adjacent to their content keep 68 percent of the revenue the ads bring in, while publishers who add a custom Google search engine to their site keep 51 percent of the revenue from those search ads. (Google has different splits for major publishers.)

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No word yet on the percentages it shares with users of its AdSense products for feeds, games or mobile. Google says it won’t provide those breakdowns because the products are “quickly evolving, and we’re still learning about the costs associated with supporting them.”