The only source there is: the 2019 Treyger collection. I wish they committed to collecting this info but it looks like the effort died after that first try.

BUT I picked Sherman because their number seems high but not clearly wrong like the ones that were $10k+ raised per kid. The fact that they have at least 3 professional fundraisers in their Parents Association as well as multiple named yearly fundraising events, lends credence to the accuracy (in my opinion).