More than 20% of the U.S. population is fully vaccinated against the coronavirus, according to data from the Centers for Disease Control and Prevention.

That means that more than 68 million Americans – or about 1 in 5 – have received either one dose of Johnson & Johnson’s vaccine or two doses of the vaccines from Moderna or Pfizer/BioNTech. More than 1 in 3 Americans have received at least one dose of vaccine.

Over 92 million doses of the Pfizer vaccine and more than 80 million doses of Moderna’s vaccine have been administered. More than 5 million Johnson & Johnson doses have been administered.

The CDC’s data tracker counts individuals as fully vaccinated when they’ve recorded the correct number of doses, but the agency advises individuals to wait two weeks after their final dose to consider themselves fully vaccinated.

The CDC last week said that fully vaccinated individuals could resume travel at a low risk to themselves, but it still advised against non-essential travel in the face of rising cases and spreading variants. Health officials this week said that the highly transmissible coronavirus variant first documented in the U.K. has become the dominant strain circulating in the U.S.

While infections are increasing and new variants are spreading, the CDC is reporting progress on vaccinations. The agency this week said that nearly 80% of teachers, school staff and child care workers had received at least one dose of a coronavirus vaccine by the end of last month.

Still, the government expects a massive dip in shipments of the Johnson & Johnson vaccine next week, showing that despite progress, the process remains vulnerable to setbacks.