https://www.npr.org/sections/health-shots/2021/01/28/960901166/how-is-the-covid-19-vaccination-campaign-going-in-your-state
"Since vaccine distribution began in the U.S. on Dec. 14, more than 66 million doses have been administered, reaching 13.6% of the total U.S. population, according to federal data collected by the Centers for Disease Control and Prevention. The U.S. is currently administering over 1.4 million shots a day."
https://www.pbs.org/newshour/nation/3-ways-that-the-u-s-population-will-change-over-the-next-decade#:~:text=The U.S. population today%2C at,just under 1.4 billion%2C respectively.
"The U.S. population at the start of 2020, numbers just over 331 million people."
13.6% of 331,000,000 is 66,000,000? I was never good at math.