freebsd stable - Sep 2006 - ipnat: map 10.0.0.0/8 -> 212.118.x.y/29: freebsd freeze

Now I use map 10.0.0.0/8 -> 212.118.z.w/32 and it works fine.
ipnat -s now shows "inuse 55633", maximus that i saw was about 80000

How to resolve this problem?