'How to perform a MIN value Grouped By Date Measure in PowerBI?

I have a measure called PERC that basically spits out a percentage. I am now creating a measure that I can place in the "Y-Axis Start" function for a trend line. I need this new measure to calculate the MIN of PERC grouped by [MonthYear] (a column in my data). How do I perform this? I have tried using the GROUPBY function but keep getting errors no matter how much I play with MIN, MINA and MINX...

My brain wants to do this:

CALCULATE(
    MIN([PERC], "*Grouped By*"('Data'[MonthYear])
    )

Thank you in advance. I'll be happy to answer any follow up questions for more context.

powerbi dax

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'How to perform a MIN value Grouped By Date Measure in PowerBI?

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