Source: The pre-1975 data are the Consumer Price Index statistics from Historical Statistics of the United States (USGPO, 1975). All data since then are from the annual Statistical Abstracts of the United States.
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Remember the most recent year you can calculate inflation for is last year, 2023 -- try again using 2023 as the most recent year, if you tried 2024 and it didn't work
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Remember not to use any commas in the number, and to use years between 1800 and 2023.