Skyrocket - Tradução em português

Hello,

Please, what's the meaning of "skyrocket"?

Example:

"The expectation would be that as cellphone use has skyrocketed we would see a correlation in the number of accidents, but that hasn't happened," said Jonathan Adkins, spokesman for the Governors Highway Safety Association. Source:http://www.chicagotribune.com/news/loca ... 6410.story