40-50%

He indicated a post-recovery image of the man, his face marked by the black
commas of implants around his eyes. “Jensen had forty to fifty percent of
his body replaced with augmentations, so there’s no way he would have
come through the incident without being affected, right? Anyhow, the next
time his name rises to the top, it’s attached to a formal declaration of his
may-be-a-corpse status.”

- Deus Ex: Black Light, Chapter 7 pg. 128