"The number of total shipment of Playstation (PS) and Playstation 2 (PS2) is 97.24M. The market penetration rate is 80% on a stationary game console market. On the other hand the number of software for PS series is 190M.

The decrease of million selling titles, unique game titles which is available only for PS and categories is challenge for PS series."

Read it here. (Not that there is much more.)