Following the recent authorization of Johnson & Johnson’s single-shot COVID vaccine—and the announcement that rival Merck will assist in its manufacturing­—America’s vaccine drive looks ready to shift into high gear. President Joe Biden said as much earlier this week when he moved up the timetable and announced that by the end of May, the nation would have supply to vaccinate every American adult against the coronavirus.

While the rollout picked up speed this week with many states now expanding eligibility to residents with underlying medical conditions, just 15.9% of the nation’s population—roughly 52.9 million Americans—had received one dose of the vaccine as of March 3, according to data from the Centers for Disease Control. That’s up from 13.7%, or 45.2 million people, a week ago. So far, 8% of the population has been fully vaccinated with two doses.

In total, about 107 million vaccines have been distributed nationwide—80.5 million, or 75.2%, of which have been administered.

Progress with the rollout remains varied among states, with the percentage of residents having received at least one dose ranging from 12.1% in Georgia to 23.3% in Alaska. The states with the largest populations, and so the largest vaccine distributions, have administered the most doses overall. California has so far given out 9.7 million shots, roughly 12% of those administered nationwide.

Share of the population that has received at least once shot