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The result of subtraction of percentages as you have done is typically given units in "percentage points" or "basis points" (with a scalar offset) in order to avoid ambiguity. The "percent change" or "percent increase" is calculated as is typical with any numerical change, (x1 - x0) / x0.

https://www.mathsisfun.com/percentage-points.html

I’m confused. Are you saying he straight up subtracted the larger number from the smaller?

Oh huh. I must not have been wearing my glasses. I thought that said 37.3. Which still is only 8.8 percentage points.

But even doing the percentage difference, I calculate a 10.2 percent increase.

So I'll just shut up and go face the corner with the parent poster.

https://xkcd.com/1102/

We're always having this same rehashed argument over and over again on HN. "My [CPU manufacturer] grew by 100% this year." Market share is an absolute percentage, so you should talk about it using absolutes. It doesn't make sense to talk about relative increases unless we're talking only about AMD revenue without respect to the overall market.

You might want to revisit your elementary school math class material...