ipfw nat show?

[wishmaster]

Hi,

Recently, I have switched from pf to ipfw. All works fine, except nat statistic.
When I type 

ipfw nat show or ipfw nat 1 show nothing is on output.

FreeBSD xxx.com 9.1-STABLE FreeBSD 9.1-STABLE #0: Tue Apr 30 22:03:16 EEST 2013     wishmaster at xxx.com:/usr/obj/usr/src/sys/MY6  i386
Kernel with VIMAGE option.

On another machine with -CURRENT all fine.
Is it bug?