Experian said it expected strong revenue growth this year after sales outpaced economic expansion in its main markets in the first quarter.The consumer credit-checking company said total revenue increased 7.0% in the three months to June 30th at constant exchange rates. "Organic" growth rose at the same rate.Chief Executive Don Robert said he expected the rate of growth to continue despite the effect of civil unrest in Brazil, which has hit some consumer businesses. Latin America was the strongest-growing region with revenue increasing 10%."For the full year, we continue to expect mid-to-high single-digit organic revenue growth, modestly improved margins (at constant currency) and cashflow conversion of at least 90%."Experian shares were down 0.9% at 1189p at 08:46. They had gained 10% since June 24th before the trading update.