In the span of just five days last month, China gave out 100 million shots of its COVID-19 vaccines.

After a slow start, China is now doing what virtually no other country in the world can: harnessing the power and all-encompassing reach of its one-party system and a maturing domestic vaccine industry to administer shots at a staggering pace. The rollout is far from perfect, including uneven distribution, but Chinese public health leaders now say they’re hoping to inoculate 80% of the population of 1.4 billion by the end of the year.

As of Tuesday, China had given out more than 680 million doses — with nearly half of those in May alone. China’s total is roughly a third of the 1.9 billion shots distributed globally, according to Our World in Data, an online research site.