The Interactive Advertising Bureau and PriceWaterhouseCoopers announced on Wednesday that Internet advertising revenues in the U.S. reached $9.26 billion for the third quarter, marking the biggest quarter on record.

Revenues climbed 18% year-over-year. In the third quarter of 2011, revenues hit $7.8 billion. The revenues also mark a 6% increase from Q2, when figures were $8.72 billion. Here’s a look at the growth dating back to 1996:

“These historic investments in interactive point to the strong results that marketers are receiving from digital marketing,” said IAB President and CEO Randall Rothenberg. “It is a highly effective medium for interacting and engaging consumers, who are no longer passive, but are active participants in contemporary media online, through social media, and on-the-go with mobile.”

Sherrill Mane, SVP, Research, Analytics & Measurement at the IAB added, “Sustained growth in internet ad revenue despite economic head winds is a testament to the value marketers get from using digital media.”

“This uptick goes beyond a significant year-over-year increase at 18 percent, and also shows a climb from last quarter as well,” said PricewaterhouseCoopers partner David Silverman. “Clearly, digital advertising is continuing its positive trajectory with incredible momentum as it heads into seasonally strong Q4.”

It’s been a good year for online business. This comes after huge amounts of online spending on Black Friday and Cyber Monday.