ETD Dashboard - Average Column in Historical Retrieval Trends .csv?

There is an “Average” column show in the .csv file I downloaded from the Historical Retrieval Trends visualization. What is the Average value?

The “Average” column and values is the average number of retrievals for a North American school for a given period. This value is an artifact from the Dissertation Dashboard and is no longer used. ProQuest will remove this value in a future release.