2009年 :Online Ad Market to Reach $16.1B
Travel, Health, Auto Among Top Growers in Search がきれいにまとめてくれるのでそのまま抜粋
Leading the field in growth as a percentage of spend:
1 Automotive - 33.8%
2 Health - 19.7%
3 Travel - 18.3%
4 Household goods - 15.1%
Taking the top spots in total dollars spent:
1 Media and entertainment - $2 billion
2 Financial services - $1.7 billion
3 Automotive - $1.4 billion
4 Travel - $1 billion