I want to know the answer to the following question:
How long since the Sichuan area has had  a severe quake?
All the background I'm provided with is that "Following the quake, experts and the general public sought information on whether or not the earthquake could have been predicted in advance, and whether or not studying statistics related to the quake could result in better prediction of earthquakes in the future.". Is that enough to answer the question?
Answer: no