Not to mention, "29% of all disasters are caused by accidents". What on earth are the rest caused by? I'm sure a few are caused by malice, but I strongly doubt that it's 61%.
I read the icon to mean 29% of data loss is caused by human error, as opposed to hardware failure, etc. How that's measured, I have no idea (the citation is "Safeware, 2001" for what it's worth).