you may know the best place
to start wth statistics is always
the U.S. government as they
usually have the most conservative
statistics. I'm not sure why
you weren't able to obtain this
information from the FBI, because
they have released numerous
studies on rape. All of which
included relevant statistics.
Perhaps you should call them
instead of looking at their
website. You should also access
site as they post this information,
some of which comes directly
from the FBI.
this doesn't help you should
try contacting Laura at the
National Clearinghouse on
Marital and Date Rape at:
2325 Oak Street, Berkeley, CA
94708-1697. You might also check
out Feminist.com's section
Against Women Links.
If after trying all of the above
you still can't find the information
you need, please contact me
and I will make other suggestions.