What is the volume of pay-per-click click-throughs on any major
Internet search engine?

IOW, how many total ad click-throughs does Google or Yahoo!/Overture
(or even total of all Internet advertising-sellers) do in a given time
period?

The time period could be by the day, week, month or year.

I'm only looking for pay-per-click volume, not page impressions.

I sort of think this is an impossible question, but I still gotta try
for the answer. Any input is appreciated.

Well Google made about 6 billion in revenue last year, and 97% of it
came from paid advertising. If that was all click throughs at 5 cents
each ( 5 cents to the other party, website or whatever? ) it would
amount to around 116 billion pay per click throughs ...

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JOHN WALKER