When describing changes I prefer to avoid words like soar, rocket and plummet because they are too "sensationalist" - they exaggerate too much, and are more journalistic than academic in style.
Instead, we can demonstrate good control of grammar by using words like increase, rise and fall as both nouns and verbs:
- London saw a significant increase in the cost of homes. (noun)
- The cost of homes in London increased significantly. (verb)
- There was a rise in house prices between 1990 and 1995. (noun)
- House prices rose between 1990 and 1995. (verb)
- There was a 7% fall in the average house price in Tokyo. (noun)
- The average Tokyo house price fell by 7%. (verb)