Trending date formulas across new year

I would like to create a summary formula that automatically updates every week for work completed the previous week.

I have a date column that indicates completion date

I have a helper column that assigns a week number using WEEKNUMBER(date) called "Week Completed"

I have a summary formula as follows:

=COUNTIF([Week Completed]:[Week Completed],(@cell=WEEKNUMBER(TODAY())-1))

Everything worked until this week. Since 52 (the last week of the year) does not equal 1-1 (This week minus 1), I get no results.

Is there another way to right a formula for "last week" or "2 weeks ago" that will survive the new year reset?

Thanks for the help.

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