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year to year growth simply refers to increased sales fron the previous fiscal year.
I dunno about that. Using the Feb 03 figures I mentioned...
PS2: 484,000 - 29% = 343,640
XBOX: 197,000 + 2% = 200,940
GCN: 164,000 - 18% = 134,480
The results look pretty close to the Feb 04 numbers. And NPD does "readjust" older figures as they go along, apparently.
If we're thinking an "entire (fiscal) year" thing, it would probably still have to be February (American fiscal year maybe, I don't know) as Microsoft specifically pointed February out. I don't know about Feb 2002, but in 03 the installed base was:
PS2: 16,802,000
XBOX: 4,962,000
GCN: 3,828,000
GBA: 12,441,000
...and in Feb 04 it was:
PS2: 22,958,000
Xbox: 8,187,000
GCN: 7,133,000
GBA: 20,601,000
That means the total increase from Feb 03 to Feb 04 was (quick subtraction):
PS2: 6,156,000
Xbox: 3,225,000
GCN: 3,305,000
GBA: 8,160,000
So the GameCube beat the XBox in America, from Feb-to-Feb. It's hard to believe that counts as a "20% weaker spanking" than the GameCube gave the XBox during this period last year.
Of course, both consoles did launch in Nov 2001. Perhaps Microsoft's trying to juggle some numbers around that. (Like, the XBox launched earlier, was probably more successful, so they hide those positive numbers in a little Jan-to-Feb window, and pretend they've had a "come from behind victory!" since day one.)
Edit: Make that a "Nov-to-Jan window". Not sure what I was thinking there...