Series is zero beginning 1968:Q4. Prior to 1968:Q4, level from Treasury Bulletin, table Corporations and Other Business-Type Activities, U.S. interest, Capital stock. The federal government formerly held equity investments in Federal Land Banks, retired in 1947; in FHLB, retired in 1951; and in Banks for Cooperatives, Federal Intermediate Credit Banks, and FNMA, all retired in 1968. Federal Land Banks, Banks for Cooperatives, and Federal Intermediate Credit Banks are now part of the Farm Credit System. Unadjusted flow is the change in the level; data for the most recent ten years show no significant seasonality.