Compare two values on different dates

What would be the best way to compare two values a year apart?

Say I have
Date                            Used
October 4, 2016          3,334
November 5, 2016      4,999
December 12, 2016    4,698
October 7, 2017          3,999

What would be the best way to compare the two October dates?  And then next month compare the two November dates, and so on.  Basically each month we would compare current month minus same month last year.

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Do you actually want to subtract last year from this year?

Create a formula
If Year({DateFIeld}) = Year(CurrentDateTime) then
    - {AmountField}

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Create another formula

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Group on the Month Number formula
Insert the field on the report
Create a summary of the field in the Month Number group footer


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