IPFW NAT show problems

[isp]

Hi! I have problems with displaing information about NAT states on
FreeBSD 9.1.
There is no information when I use `ipfw nat 1 show`

[#west-router:/]# uname -a
FreeBSD west-router 9.1-RELEASE FreeBSD 9.1-RELEASE #1 r253313M: Sat Jul
13 07:13:57 EEST 2013    
root at west-router:/usr/obj/usr/src/sys/WEST-ROUTER  amd64

[#west-router:/]# ipfw nat 1 show config
ipfw nat 1 config ip 10.100.205.32 deny_in same_ports reset
[#west-router:/]# ipfw nat 1 show
[#west-router:/]# ipfw show | grep nat
00241 20871470986 23524032038600 nat tablearg ip from not table(9) to
table(11) in recv igb1
00242 15071498221  5593662903282 nat tablearg ip from table(12) to not
table(9) out recv vlan* xmit igb1


>