Apple’s (AAPL) share of the global tablet market is in decline now that low-cost Android slates are proliferating, but the iPad still appears to be the most used tablet by a huge margin. Ad firm Chitika regularly monitors tablet traffic in the United States and Canada and in its latest report, Apple’s iPad was responsible for almost 90% of all tablet traffic across the company’s massive network.

Using a sample of tens of millions of impressions served to tablets between December 8th and December 14th this year, Chitika determined that various iPad models collectively accounted for 87% of tablet traffic in North America. That figure is down a point from the prior month but still represents a commanding lead in the space.

The next closest device line, Amazon’s (AMZN) Kindle Fire tablet family, had a 4.25% share of tablet traffic during that period, up from 3.57% in November. Samsung’s (005930) Galaxy tablets made up 2.65% of traffic, up from 2.36%, and Google’s (GOOG) Nexus 7 and Nexus 10 tablets combined to account for 1.06% of tablet traffic in early December.

“Despite these gains by some of the bigger players in the tablet marketplace, there has been a negligible impact to Apple’s dominant usage share,” Chitika wrote in a post on its blog.