%ages
You'd never had 58% yellow and 98% blue. Since the scope of these two bars slightly overlaps, the last digit of the yellow and the first digit of the blue will ALWAYS be the same, right?
Y: 12% B: 25%
Y: 99% B: 92%
etc
One easy way to look at it is just ignore the first digit of blue and use the second digit as you tenths place. I don't think you can do this kind of math with an XML document, but to combine the two mathematically, I think you can do:
Yellow_value + ((Blue_value mod 10) / 10)
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