- Average benefit of non-dually entitled aged spouses, aged widow(er)s, and parents shown earlier.
- Historical average secondary benefits of dually-entitled beneficiaries, by type, are from 1-A Table Current-Payment Supplement. Future figures are computed by applying the corresponding ratio to the average benefit of non-dually-entitled beneficiaries.
- Historical ratios of average secondary benefits to average benefits of non-dually-entitled beneficiaries, by type, are computed by division of corresponding figures. Future figures are projected by regression.