Reportedly, since Google Places replaced the Google Local Business Center, the statistics within Google Places have been off. A Google Places Help thread has reports from local businesses that the stats are off.
Joel H. from Google did confirm an issue, he said:
So clearly something is not right. One business owner said, “They used to say i got 150 clicks/month on one listing and now it says 0.”
Do you see issues in your stats?
Forum discussion at Google Places Help.