Is there a chart that shows percent of market share vs. time?

[shams]

I would love ioi to add "market share" as one of the graphical options on this site.

I don't imagine its too hard (as long as you have 'context' - i.e. Wii/360/PS3 make one market, DS/PSP make another - harder to exclude/include other console types such as the PS2).

I haven't seen anything that actually does this (on this site) yet.