Here's our internal data on this. Based on page view data (values below are page views) and using the statistics from Google DoubleClick Ad Planner (http://www.google.com/adplanner/static/top1000/) we have the following for the last 30 days:
Yes. We have detailed stats on page views, hits, bandwidth, cache hits, etc. etc. Looking at the most recent data which I get daily I see in the trailing 30 days: 27B page views and 162B hits.