Task: Question Generation
Input (English): Passage: Since 1999, the overall crime rate of Charleston has declined markedly. The total crime index rate for Charleston in 1999 was 597.1 crimes committed per 100,000 people, while in 2011, the total crime index rate was 236.4 per 100,000.
Output (English): How many less crimes per person existed in 2011 from 1999?