The percentage of electronics at the end of their lives which were recycled.
The EPA found that the percentage remained consistent from 1999-2005. Even as recycling rates went up, the amount of electronics reaching end of life outpaced the increase, leaving the figure static. (source: EPA, July 2008)
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The chart contains two Wall-Es.
The 3 Disc Special Edition is the one where BDs had a 35.47% market share. That is, if they shifted 6,453 copies of Wall-E 3 Disc Special Edition DVD, then they shifted 3547 copies of Wall-E 3 Disc Special Edition BD.
However, the three disc special edition BD was also considerably less popular than the regular Wall-E BD, which sold three times as many copies, but only managed a 7.85% marketshare. That is, if they shifted 41,467 copies of Wall-E Widescreen/Fullscreen single disc edition, then they shifted 3,533 copies of regular, non-three disc, Wall-E BD.
Over-all, the Wall-E market share was slightly under 13%, which was good for Blu-ray but isn't anything close to the 1/3 you're suggesting.
So it's not the case that "over 1/3 of all Wall-E movies sold being on Blu-ray" for a variety of reasons.