The labour market condition in a region where the unemployment rate skyrocketed from 6 to 10 percent is no better than in the region where the rate fell from 13 to 12 percent.
I can't find a word that fits there except "skyrocketed". "Soared" or "surged" does not work there for some reason. It just does not sound right to my ears.
I am happy with how skyrocketed sounds, but the word is informal. And I am writing an academic paper.