Until 2007, the BLS rounded CPI index values to one decimal place; beginning in 2007, it published new CPI data to three decimal places, effectively eliminating the base-related rounding problem for new data.
Notes on verification
Confirmed by BLS's own official announcements and publications, a BLS-commissioned research paper, and an independent CRS report, all consistent in details. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- Was There a Great Moderation for Inflation Volatility? (seed:economics_and_business)
- https://www.bls.gov/news.release/archives/cpi_12152006.pdf (corroboration)
- https://www.bls.gov/cpi/factsheets/cpi-math-calculations.pdf (corroboration)
- https://www.everycrsreport.com/reports/RL30074.html (corroboration)
- https://www.bls.gov/osmr/research-papers/2006/pdf/ec060090.pdf (corroboration)