What is the current cost of medicolegal settlements in OB?

Does anyone know of an official registry or source of data on the cost of settlement/awards in obstetrical claims by type of injury? Am aware of Steve’s article from 2008.  Was looking for something current.

Reducing obstetric litigation through alterations in practice patterns. Clark SL, Belfort MA, Dildy GA, Meyers JA. Obstet Gynecol. 2008 Dec;112(6):1279-83.