Since 2010:Q4, level from quarterly Reports of Condition for Corporate Credit Unions (form NCUA 5310), schedule A-3 Investments, Commercial Paper (CUCP8019). Prior to 2010:Q4, level from U.S. Central Credit Union Quarterly Financial Supplement, table Consolidated Fair Value Balance Sheet, Investment securities, Commercial paper (at Carrying Value). Unadjusted flow is the change in the level; data for the most recent ten years show no significant seasonality.