Google Base Blog declared about there new service of tracking clicks and impressions. Everytime a person clicks on an item, an impression is created. For this Google has added three new columns on the items dashboard:impressions, clicks and page views. Impressions and clicks can be updated once a day whereas hosted page views can be updated several times a day.
Google Base offers you with its service to keep a record of total impressions, clicks and page views of posted items. It starts counting as soon as the item is published. You can view statistics as far back as June 7,2006. For any item created before this date, the information will not available. Click and impression statstics are updated daily while page view statistics are updated several times a day. A tip from Goolge say's that if you have more impressions in comparision to number of clicks, then you can enrich its  tittle and  add detailed attributes, images etc to make it more appealing and increase your click rates.