Im not sure about now, but true used to be -1 and false 0 and you could put 0 or -1 into a query as a criteria and it would give you the correct result. If it still is, it seems to me you could create a calculated field in a query which summed the fields and multiplied the result by -1 to give you yes responses and sum the fields and add the result to 14 (because the total of yes is a negative number, this would give you the difference) for the number of no responses.