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SUBMIT YOUR IDEAMay have gotten distracted and reworked the macro instead of fixing it :-S
also, I had troubles understanding the wording:
For example, for June 2013, the denominator would be the total number of accounts open between June 1, 2011 and May 31, 2013. The numerator will be total number of accounts closed in June 2013 or between June 1, 2013 and June 30, 2013.
But it seems they are using as numerator the accounts closed in June 2013 and open before June 2013
So, instead of:
DateTimeYear([Month]) = DateTimeYear([Close_Date]) AND DateTimeMonth([Month]) = DateTimeMonth([Close_Date])
This:
DateTimeYear([Month]) = DateTimeYear([Close_Date]) AND DateTimeMonth([Month]) = DateTimeMonth([Close_Date]) AND [Open_Date]<[Month]