WAKEFIELD, Massachusetts: A new report from the Search Engine Marketing Professional Organization claims North American advertisers spent nearly £10 billion (€7.68bn; £5.13bn) on search engine marketing last year, a rise of 62% over 2005.

SEMPO predicts spending in the medium will almost double by 2011, reaching $18.5bn, driven by continued advertiser demand, rising prices and a new wave of small-to-midsize businesses.

Among the marketers and advertising agencies surveyed, 96% reported using Google AdWords to promote their brands, while 86% said they ran their ads on Yahoo's search product. Meanwhile MSN was used by 68% of advertisers in 2006, up from 30% in 2005.

Data sourced from Adweek (USA); additional content by WARC staff