NPD also didn't start till the first full week in January because NPD December ran into it, so they don't include the week ending the 5th Jan.
Give me a second I will make a table you can copy (assuming those NPD numbers are correct)
edit. this is the correct set of VGC numbers to correspond with NPD Jan-Jun
| Console |
Wii |
PS3 |
X360 |
PSP |
DS |
|
America
|
3,911,078
|
1,711,802
|
1,638,405
|
1,680,688
|
3,628,702
|
| NPD (USA) |
3,482,000 |
1,608,000 |
1,354,000 |
1,482,000 |
3,187,000 |
The thing you have to understand is that it is generally ok to take off 10% (from Americas) when you are talking about the whole market... but individual consoles can sometimes differ slightly because they are more or less popular in other countries (PSP used to do terribly in Canada, PS3 used to as well but I think it picked up, 360 used to be comparitively more popular, I am not sure about now because we haven't had a recent NPD for Canada)
So if you add up all the consoles together. and then multiply NPD by 1.1 it comes out very close to VGC (I think VGC is about 200k higher) but like I said, the PSP doesn't do so well in Canada, but DS and Wii now do better, so using the same rule on them is slightly flawed.