TWRoO on 05 December 2008
The thing that makes it more complex is that multplying by 0.9 is really more of a general rule for the whole market (Canada is not quite 0.1 on it's own Max, it's usually more like 8%, and given Black Friday is a US thing should be slightly less this time)
This general rule doesn't apply equally to all consoles, so it might be more accurate to multiply DS by 0.87 and PSP by 0.91 or something like that (it could be the reverse, it's hard to know)
Without reliable Canadian NPD data each month (it seems to come sporadically) it's hard to get all the data together and make a good comparison.... this is why *0.9 is a vague rule rather than a means to point out which console is 10k overtracked.
