Unique requests is the number of unique visitors who ran this query this month.
Total requests is the total times this query was run this month; most often this number is increased beyond the number of unique requests when visitors browse beyond the first page of results. It can also reflect a person executing the same search multiple times and during multiple visits.
Query is all forms of the query displayed. For example internship and internships are the same query.
Documents returned is the number of results returned the first time the query was run that month.
Use the dropdown box labeled Return the first and click Refresh to control the number of queries displayed (from most to least popular).
Change overall queries to queries with no results and click Refresh to see a very interesting report!