The article links to a report from the library of congress, from which it gets it's numbers. The congressional report is quite informative, and and non-partisan

The article links to a report from the library of congress, from which it gets it's numbers. The congressional report is quite informative, and and non-partisan. https://www.congress.gov/crs-product/R49057 https://www.congress.gov/crs-product/R49057