alt Hacker NewsCovid doesn't explain the drop from 2012 to 2020 though, as the tests were administered Fall of 2019 and therefore pre-Covid.
Covid doesn't explain the drop from 2012 to 2020 though, as the tests were administered Fall of 2019 and therefore pre-Covid.
The decrease from 2012 to 2020 was much less and generally not statistically significant. Further 2012 was the all time high, you'd expect some regression to the mean.