NEW YORK: The growth of digital advertising allowed the industry in the US to grow revenues by 8.6% last year, despite a lackluster market.

The 2008 Agency Report from Advertising Age reveals digital services brought in 12.3% of worldwide revenues for a quartet of the biggest global conglomerates - Omnicom Group, WPP Group, Interpublic Group and Publicis Groupe.

UK-headquartered WPP reported worldwide digital revenue for its media unit, Group M, climbed 53% to $238 million (€153.6m; £120.6m). It heads the global media agency league.

The survey shows that the US revenue growth rate for agencies of all disciplines last year was just below 2006 growth (8.8%). Agency revenue grew 7.2% in 2005 and 8.6% in 2004.

AdAge estimates revenue for US advertising, marketing-services and media agencies in 2007 reached $31.1 billion.

Marketing-services agencies - direct, promotion, branding, healthcare and public relations as well as digital specialists - accounted for 47.1% of US revenue for marcoms agencies analyzed in the report. The rest came from advertising and media.

The top US agency in 2007 was Omnicom's BBDO Worldwide.

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Data sourced from; additional content by WARC staff