- 1990 to 19945,138
- 1995 to 19996,088
- 2000 to 20042,420
- 2005 to 2009453
- 2010 to 20141,351
- 2015 to 2019695
The preservation of the Duke University Libraries Digital Collections and the Duke Digital Repository programs are supported in part by the Lowell and Eileen Aptman Digital Preservation Fund