It is tracked! there are a few different numbers. by the BEA: https://fred.stlouisfed.org/graph/?g=gX0f https://fred.stlouisfed.org/graph/?g=gX0f by the treas

It is tracked! there are a few different numbers. by the BEA: https://fred.stlouisfed.org/graph/?g=gX0f https://fred.stlouisfed.org/graph/?g=gX0f by the treasury: https://ticdata.treasury.gov/resource-center/data-chart-center/tic/Documents/shl2024r.pdf https://ticdata.treasury.gov/resource-center/data-chart-cent... It's a little hard to figure out how important it is, but there are "good" numbers.