Something

      Number of items expelled per item condemned

current #damned    #expelled                     gain/loss per 

  <= 5             .12                           +0.88
  <= 10            .25                           +0.75
  <= 15            .40                           +0.60
  <= 20            .65 + .65*.02 = 0.663         +0.337
  <= 30            .80 + .80*.04 = 0.832         +0.168
  <= 45            .82 + .82*.05 = 0.861         +0.139
  <= 60            .85 + .85*.06 = 0.901         +0.099
  >  60            .95 + .95*.10 = 1.045         -0.045