Actually, even lower than commonly suspected. In the seminal study of orphanage conditions by Twist (1837), not one instance of additional servings was reported.

However, there's a potential upside. Troublemakers in orphanages were seen to be more likely to be sold rapidly by their caretakers, and some of them found themselves climbing the social ladder rapidly as a result. Effectively, it was like playing a lottery - most orphans adopted out of such a process didn't win, but the ones that did, won big. Again, Twist documents a particularly notable case.