Those stats are the discrete chip sales. Could be a laptop, could be a desktop. Intel's market has actually shrunk due to the inclusion of the graphics chip into the CPU. Those are not counted in the stats, which dropped Intel from a high of 68.3% to what it is today.
So why make a comparison in market share of Intel graphics chips (assume you are referring to 3500,4000 chips), which are a mainstream chip not designed for gaming and installed in most laptops for their power saving 2D graphic attributes.
Compared to AMD, Nvidia who make dedicated GPU's that cost up to $1000 each?
<S>...-Gixer