I imagined something like this would happen when ioi first started doing Europe software, he can only track what he gets enough data for.
If you look at this week specifically (use the Worlwide tab rather than Other) you will see only 26 DS games are included, and only 30 Wii games/22 PS3 games/24 X360 games.
None of the consoles has a complete set of software by a long shot, so you cannot use the "total software" chart accurately for others yet.... in time it will get better (not sure whether historical data will ever be complete)
It is exactly the same as the America software for last generation, apparently the PS2 sold only 150 million software units, but we know that is way too low... it's just ioi doesn't have data stretching back to the launch of the PS2.
_____________________________________________________________
Basically all platforms software totals would be a lot higher if the charts were more complete, the PSP would (percentage wise) certainly get a bigger boost because of the minute number of titles tracked, but that is because none of it's titles do well enough to get high into the charts.
At the moment the others charts are mainly for seeing what specific games do, nd they do give an idea of how the total software goes (PSP will still be the lowest in actual total software, it just won't be as significantly behind)
EDIT: ioi got there first.
