South Florida consistently has generated some of the largest volumes of questionable insurance claims among metropolitan regions nationwide over the past three years, according to an industry report released Tuesday. The Sunshine State was the only one with three cities in the top 10 last year: Miami, Orlando and Tampa. The National Insurance Crime Bureau, a nonprofit arm of the insurance industry that tracks fraud and theft, analyzed 251,394 questionable claims nationwide from all types of policies from 2008 through 2010.