The number of visitors to the federal government's HealthCare.gov Web site plummeted 88 percent between Oct. 1 and Oct. 13, according to a new analysis of America's online use, while less than half of 1 percent of the site's visitors successfully enrolled for health insurance the first week.

The new numbers on the Affordable Care Act — released by Kantar US Insights, and based on an assessment conducted by the nonpartisan research firm Millward Brown Digital — provide a snapshot of how the federal health-care exchange has fared since it launched at the start of the month.

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