Comprehensive analysis of datasets is here: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2701317

Discussion of recent performance data are here:
https://uncipc.org/index.php/publication/have-private-equity-returns-re…
(appeared in Journal of Private equity, Fall 2019, 22 (4) 11-18.)

These and many more are in the public domain and easy to find.