I have a Filemaker 11 database with People related to Conference Registration.

1 person may have 1 or more conference registration records.


What is the best way (calc/script) to answer this question:


What percent of people attended the 2010 and 2012 conference?


(Note: the user would pick a series of years (2-4) and want the percent that 
attended all)


Thanks in advance.

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