Variable for amount of zombies

[precog29]

Where is the variable for the amount of zombies that are spawned or within the map at one time.

I read that it is at 64 in a post I can no longer find.

With the dedicated server and sdk, I would like to make a modification as to where there could be 200 zombies spawned and actively trying to kill the team.

With more than 6 players the release of new zombies is very slow, and I would like to find that variable so team members are not "waiting" for zombies to spawn.