I would recommend contacting AASLH.  They work with many small institutions and may have the statistics you are looking for.

I thoroughly understand how difficult it can be.  Being open can help you recruit volunteers by building community awareness, but is worthless if there is not a program to support.

Good luck,
Cheryl Brookshear
Curator of Education (1 of 2 staff)
Hearthstone Historic House Museum

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