The Social Security Administration said Tuesday it has made substantial progress cleaning up the Social Security Number database, an effort it called the most comprehensive record cleanup in the agency’s 91-year history.

According to the SSA, it has corrected nearly 15 percent of all active Social Security Numbers since the beginning of the Trump Administration. The agency said the work covers approximately 330 million U.S. citizens and nearly 390 million total records.

The SSA said that as part of the effort it:

• Added 17 million dates of death to records that previously lacked them, using internal SSA systems and Department of State data.
• Updated approximately 25 million records that were missing citizenship information, using data from the Department of Homeland Security’s SAVE service.
• Is now correcting an additional 8.5 million records with inaccurate citizenship status.
• Put stronger internal controls in place to prevent inaccuracies caused by manual data entry.

“The Social Security Number database is our country’s books and records. The database’s accuracy is essential to maintaining integrity of government services for citizens. Accurate SSN records prevent fraud across federal programs and support the proper administration of benefits,” said SSA Commissioner Frank J. Bisignano. “This is the first time SSA has undertaken an effort of this scale, and I am proud of the work we have done to strengthen the foundation of identity data relied upon throughout government and the economy.”