per-user ftp traffic accounting ... possible ?

[Ensel Sharon]

I am using the standard, stock FreeBSD ftpd, running out of inetd.

Is there any way to keep track of how much ftp traffic is generated by
each individual user ?  

I do not see it keeping track of anything except for ftp logins.  I know I
can keep track of all ftp traffic in general with ipfw, but I need a
per-user breakdown.

All suggestions/comments appreciated.

Thanks,