108% in TEN years, i.e., an annual growth rate of 10.8% within that period. This is consistent with reports on China's growth from several sources.
About the per-capita income, since China's rates of growth are supposedly faster than America's, what can be theoretically interpreted from this article, and needn't be taken as fact, is that a car travelling at 10.8 mph will eventually catch up with one travelling at 2.5 mph, no matter what the gap between the two, provided both travel through the same route(i.e the same time period).
But they don't, of course. China is a developing country with enormous built in demand and a still rather primitive (overall) infrastructure. It would be absurd to extrapolate that rate of growth out indefinitely. Not going to happen.
Actually, 108% growth over 10 years is only 7.6% growth per year.