7 Months Ago, Softpedia says (in Square Enix Acquires Eidos, Unveils Sales Data)  Romania
All of the Tomb Raider videogames released until now have gotten around 30 million units in sales, the two Hitman games have sold 8 million copies; other successful properties, which Square Enix is probably planning to continue developing - Kane ...

And Tomb Raider News Channel says (in Square Enix reveals lifetime worldwide sales figures of all Tomb Raider games) Square Enix has published the lifetime worldwide sales figures for the Tomb Raider franchise, as part of a Corporate Strategy Meeting on April 22th, focusing on the integration of Eidos.