The percentage of Americans who have no health insurance has hit its lowest point since 2008, according to new data from Gallup.

The numbers come a week after the White House announced that over 7 million Americans had signed up for coverage under the health-care exchanges created by Obamacare.

The percentage of Americans with no insurance has dropped from 18 percent six months ago -- when the health insurance marketplaces opened -- to 15.6 percent today.

The last time that number was as low was around the time of the economic collapse of 2008. In the latter part of that year, 15.4 percent of Americans had health insurance.

Until the Obamacare marketplaces opened Oct. 1, that number had been rising steadily.

Here's the breakdown by age group: