- Number of retired workers shown earlier.
- Historical number of dual entitlements for spouses, widow(er)s and parents from 1-A Table Current-Payment Supplement. Historical dual entitlements by type are split by sex by applying ratios computed from data in the Annual Statistical Supplement to the Social Security Bulletin. Total dual entitlements is the sum of spouse, widow(er), and parent dual entitlements. Future figures for total dual entitlements computed by applying the corresponding ratio to the number of retired workers.
- Historical ratios of number of dual entitlements to number of retired workers are computed by dividing number of dual entitlements by the number of retired workers. Future ratios projected by regression.
- Historical ratios of number of dual entitlements by type to total dual entitlements are computed. Future ratios projected for spouses and parents by regression. Future ratios for widow(er)s are computed as 100 percent minus the sum of the ratios for spouses and parents.
- Future figures for number of dual entitlements by type are computed by applying the corresponding ratios to the total number of dual entitlements.