H1-B's by Country
This is even more eye-opening:
https://www.uscis.gov/sites/default/files/document/reports/h-1b-petitions-by-gender-country-of-birth-fy2018.pdf
In 2018, a massive 73.9% of all H1-B visas vent to people from India (mostly men, as woman aren't worth much there), even though it's a 3rd world country with an education system that isn't exactly at the upper end of the global rankings, nor does India have a particularly well educated populace. What it does have however is a large industry of "degree factories" producing worthless certificates and degrees which are then used to undercut wages in other countries like the US.