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Month on Month Error with sporadic data



Would welcome some help with a formula i've been strugging to get right. I have a report pulling commodity data from various sources. As an example, USDA. I have a report guiding users to select a commodity showing price history, some smart narrative and key headlines such as MoM, QoQ, YoY. The latter just isn't right, however. I feel like it is due to the fact the pricing is monthly, and I just have a date field set to the first of the month, linked to a calendar table. I then have measures set up such as:


Value MoM% USDA =
    DIVIDE([Latest Price USDA] - __PREV_MONTH, __PREV_MONTH)
I suppose what I need is a formula that takes the last month's average (there is a lag to data so won't always be the current calendar month), and compare's it to one month/quarter/year prior. I just can't for the life of me figure it out. 
Appreciate any help! 
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For further detail, here's the desired output. As you can see from the chart - 11% is nowhere near correct. The measure is in a card with the 'top 1 latest date' filter added, and no interation with date slider. 


I have another dataset from the IMF where it seems to work - not sure why this is any different. 

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