This can, on occasion, be a larger number than the inserts because someone may have gotten the insert at 2359 in the previous day (seen in yesterday's logs) while our Web server served your add at 0001 today. In addition, if someone presses reload or otherwise makes another request for your ad-image, this raises the ads-served numbers as well.
Note: If this number is consistently and exactly 100%, it means that the ads are being served remotely (that is, they are not stored on our machine), and so we have no way of knowing how many actual downloads are served.
Note: The scale of the graphs is different for the summary and for each ad in a package. That is, a one inch bar in one ad may represent 10,000 in the summary, but only 500 in an ad (but the scale is the same for all bars in a single chart).