LOS ANGELES (AP) — Americans cranked up their use of credit cards in the third quarter, racking up more debt than a year ago, while also being less diligent about making payments on time, an analysis of consumer-credit data shows. The average credit card debt per borrower in the U.S. grew 4.9 percent in the July-to-September period from a year earlier to $4,996, credit reporting agency TransUnion said Monday. At the same time, the rate of credit card payments at least 90 days overdue hit 0.75 percent, up from 0.71 percent in the third quarter of last year, the firm said.