Credit checking firm Experian experienced underlying revenue growth in all geographic sectors in the final quarter of 2011, with Latin America growing especially rapidly.In the three months to 31 December 2011 - the third quarter of the group's financial year - total revenue from continuing activities increased by 12% at constant exchange rates (CER) from the year before. Group organic revenue growth was 7% year-on-year using CER. By principal activity, organic revenue growth was 15% at Credit Services, 3% at Decision Analytics, and 7% at Marketing Services. Organic revenue declined 1% at Interactive.Latin America's organic growth at CER was 27%, while both the UK & Ireland and the Europe, Middle East, Africa (EMEA)/Asia Pacific regional groups racked up 7% growth. North America's underlying revenue growth was 2%."Looking ahead, we expect organic revenue growth for the second half to be at least as strong as the third quarter, while for the year as a whole, we reiterate our expectations of modest margin improvement and strong cash flow conversion," said Don Robert, Chief Executive Officer of Experian.jh