The difference between my 14% and your 12.5% is probably a matter of which way we're counting. I took the chart ratios of 1.615:1 and 1.419:1 and divided to find that the higher one is 14% higher than the lower one. If you work the other way, the lower one is only 12.5% smaller than the higher one. It's a matter of which is the basis of comparison.
Consider one and two, 1 is 50% smaller than two, but 2 is 100% larger than one. BTW- once you understand this tiny mathematical paradox, you'll never trust government or advertising statistics again.
It doesn't matter which way you measure the steps, as long as you're consistent in which way you measure.
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