Spanish-language media and heavy spenders, such as PepsiCo, are the major bright spots, according to the analyst TNS Media Intelligence.
However, the country's ten biggest advertisers, half of which boosted their budgets, accounted for only a 1.6 per cent increase.
Spending on the top ten ad categories fell by 1.8 per cent. Even internet display ads, which had been posting the biggest growth rates, tapered off to 8.5 per cent.