From FAS Project on Government Secrecy:
More than two years ago, President Obama set a December 31, 2013 deadline for completing the declassification processing of a backlog of more than 400 million pages of classified historical records that were over 25 years old. But judging from the limited progress to date, it now seems highly unlikely that the President’s directive will be fulfilled.
As of December 2011, following two years of operation, the National Declassification Center had completed the processing of only 26.6 million pages of the 400 million page backlog, according to the latest NDC semi-annual report. If the Center increased productivity by a factor of ten, that would still be insufficient to achieve its goal.