OPM's Federal Employee Retirement Statistics
Snippet of Article: "... data represents the total Civil Service Retirement System (CSRS) and Federal Employees Retirement System (FERS) Annuitants added to the Annuity Roll Processing System (ARPS) from Fiscal Year 2000 to Fiscal Year 2022. These numbers include all employees whose retirement was processed as of September 30. ..."
Source: www.opm.gov