Windows 2003 Server: How can I see DHCP lease history?

I need to be able to see who had what IP address at any given time in the past. Currently the only logging I see are a week’s worth of errors, if any.

Is there a setting I’m missing?

If I get bittorrent activity in my proxy log from the previous day, and it’s associated with IP x, the DHCP server only tells me who has IP x *currently*. If the lease changed to a different owner, how do I see who it was the day before?

Thanks,

-Travis