International revenue contributed 44% of total revenue in the fourth quarter. Had foreign exchange rates remained constant in the second half, revenues in the fourth quarter would have been $18 million lower. Had foreign exchange rates remained constant from the fourth quarter of 2005 through the fourth quarter, revenue would have been $81 million lower.
Aggregate paid clicks, which include clicks related to ads served on Google sites and AdSense partners, rose 61% from a year ago and 22% sequentially.


