Because it's split into weekly sales.

Yeah, also shows the yearly rate of million sellers too, 24, that'll probably slow to below 20 this coming year

I believe March was 5 weeks, so probably closer to 200k for the PSP.

Also it seems the PS3 was around 350-375k in March for the US.

EDIT: Also I am pretty sure the million seller list is shipped, not sold to consumers.
EDIT2: Yup, definitely shipped.

according to neogaf

365k

Seems that Black and White is a bit overtracked in the US.

3,417,805 after 6 weeks on VGC

~2.6 million (so maybe 2.9 for NA) after 6 weeks according to Nintendo.

Wowza, so it's likely in the 80/90 range

Wow.  They have LittleBigPlanet 2 as the third best selling game over the quarter in the UK:

It also showed up 5th in Germany, but it didn't even chart in France or Spain.

The also have Killzone 3 between 8th and 12th in the UK, Germany, and France, which is comparable to its 11th place in the US chart.  LBP2 seems to have handedly beaten it in the UK, and edged it out in Germany, but KZ3 appears to have sold considerably better between the two in both France and Spain.

More charts:

And last, but not least, the US:

woah those are some interesting numbers 0_0

Ninty stuff are overtracked a lot isn't it? heck even the number of million selles is overtracked lol so sw is also overtracked

ps3 and psp undertracked

3DS overtracked a lot

Not sure if it hurt it at all, but both Spain and France seperate regular and collector's editions.  It never charted in Spain though.  Not even the top 10 January PS3 chart.  In France it was number one and five (regular/collector's) the week it came out.  It was gone after that though.  That is pretty common though since they just give a top 5 for consoles plus handhelds.

Spain seems to have some odd buying habits compared to other countries.  The first LBP only charted for the PS3 only chart, and even then only in November/December.  It was outsold by Buzz in December.  Uncharted 2 was actually outsold by Eyepet in both November and December 2009.

Total extracted from the graph by me (error: /- 16k):

PS3: 1.09 million
360: 0.76 million
WII: 0.75 million

Japan US "Europe" Q1 hardware sales (all up to week 13):

PS3: 2.45 million
360: 2.09 million
WII: 2.00 million

Total extracted from the graph by me (error: /- 29k):

NDS: 1.00 million
PSP: 0.48 million
3DS: 0.46 million

Japan US "Europe" Q1 hardware sales (all up to week 13):

NDS: 2.48 million
3DS: 1.64 million
PSP: 1.43 million

From http://www.neogaf.com/forum/showthread.php?t=428513