Of the total visitors to museums in the US, how many sign up for audio
tours (where available) and how much did they spend?
 
Helpful links: From the American Association of Museums, we know there
were 865 million museum visitors in 1999.
<a href="http://www.aam-us.org/infocenter/faqs.htm">http://www.aam-us.org/infocenter/faqs.htm</a>
Also, Visible Interactive estimated 20 million visitors generated $80
MM in 1994
<a href="http://gsbwww.uchicago.edu/fac/steven.kaplan/teaching/visiblea.pdf">http://gsbwww.uchicago.edu/fac/steven.kaplan/teaching/visiblea.pdf</a> 

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Clarification of Question by chao-ga on 07 May 2002 18:49 PDT

Ideally, I would like numbers for Year 2001, but 2000 or even 1999
would be fine too.