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Determining amount of inflation between two dates
You want percent change between the two numbers listed under whatever heading you'll be using in the CPI. As an example, you'd probably want to use the All Items heading listed here on Page 4 of the August 2016 CPI tables as 240.853, and from August 2015 was listed as 238.316.  Percent change is  So 1.06% inflation from August 2015 to August 2016.