Robuta

https://www.ssa.gov/OACT/TR/TR04/lr5A2-h.html

Social Security Area Population as of July 1 and Dependency Ratios, Historical Period

social security area population july dependency

https://www.ssa.gov/OACT/TR/TR05/lr5A2-2.html

Table V.A2--Social Security Area Population as of July 1 and Dependency Ratios, Intermediate...

social security table v area population

https://www.nationmaster.com/country-info/stats/People/Dependency-ratios/Total-dependency-ratio

Countries Compared by People > Dependency ratios > Total dependency ratio. International Statistics...

dependency ratios countries compared people total

https://www.ssa.gov/OACT/TR/TR05/lr5A2-3.html

Table V.A2--Social Security Area Population as of July 1 and Dependency Ratios, High Cost...

social security table v area population