What exactly does this value mean?

[Jdalt40]

Hey guys, I just got a problem for what this one value means
Just to see what I'm referring to:

<li Class="PawnGroupMaker_Normal">
        <commonality>100</commonality>
        <options>
          <Drifter>5</Drifter> -What does this refer to? Chance? Pawn raid value?
</options>
      </li>

[skullywag]

Drifter is a pawnkind, thats saying make a group of 5 drifters.