- 1973 to 19746,223
- 1975 to 19799,260
- 1980 to 19846,590
- 1985 to 19898,426
- 1990 to 19943,684
- 1995 to 19995,109
- 2000 to 20042,093
- 2005 to 2009191
- 2010346
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