Pretty sure this wouldn't be a Proc Tabulate as it has very little in the way of "use a result from row x to calculate row y".
Looks more like a summary step to get the count per month overall and per "exclusion" then a pass through at data step.
But not even going to suggest dummy code without a small example as your data may be structured quite differently that I am imagining it to be.
Hint: Example data should not include more than may 20 total "exclusions" for a month and should include no more than 3 months unless more are needed to demonstrate some peculiarity of your data such as differing "criteria" per month.
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