LOS ANGELES (AP) - Many Americans took on more credit card debt and failed to make timely payments in the final quarter of 2013. Even so, the national late-payment rate remains close to its lowest level in six years. Credit reporting agency TransUnion said Tuesday that the rate of credit card payments at least 90 days overdue was 1.48 percent in the October-December quarter. That's up from 1.36 percent in the previous quarter, but down from 1.61 percent in the fourth quarter of 2012. Average card debt per borrower rose 1.7 percent from the third quarter to an average of $5,325. It slipped 1 percent from a year earlier. A sequential uptick in late payments and card balances is common in the fourth quarter, which coincides with the holiday shopping season.