> Also, charts like that are very common in financial publications. The target audience knows how to read them.
Yea, I've never really understood this complaint. Except in publications targeted only at the most ignorant or innumerate audiences, it's ludicrous to claim that the only magnitude of change that can matter is one that's visible on a 0-100 scale.
Ignorant and innumerate audiences do exist, but this isn't a general-purpose argument against ever having enough respect for your audience that you can use the scale that lets you most accurately convey the data.