- 2004 to 2004 65
- 2005 to 2005 39
- 2006 to 2006 50
- 2007 to 2007 30
- 2008 to 2008 43
- 2009 to 2009 103
- 2010 to 2010 344
- 2011 to 2011 223
- 2012 to 2012 271
- 2013 to 2013 224
- 2014 to 2014 83
- 2015 to 2015 64
- 2016 to 2016 166
- 2017 to 2017 153
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