7-Jan 133,000 155,000
7-Feb 63,000 107,000
7-Mar 77,000 106,000
7-Apr 52,000 49,000
7-May 44,000 36,000
7-Jun 65,000 52,000
7-Jul 54,000 79,000
7-Aug 57,000 78,000
7-Sep 61,000 61,000
Month PS2 PS3
PS2 outsold PS3 in some months in 2007, The reasons why an older console would outsell is successor are clear, it has a lower price with a bigger library that have a lower price and a bigger catalog of software that can be bought used for even less money.
In the case of the PSP is a even more valid option when the 3DS makes it look like a rather competent device, instead of obsolete hardware. Sony needs to work the software aspect of the device and provide experiences that are unique to their machine.