Monthly from 1990 - rotate to explore inversions in 2006, 2019, and 2022
See also: US Federal Debt · S&P 500 International Exposure
Source: Federal Reserve (FRED). Series DGS3MO through DGS30. Monthly last-observation. 30Y had a gap 2002-2006 (forward-filled). Recession bands from FRED USREC.