Source data: http://data.uis.unesco.org/

Statistical data: varies by country, from 2018 to 2021

Statistical adjustment: i used the average of the last 2 years data for each country, because i have seen that the number of teachers can vary easily 10% from one year to another, sometimes up and sometimes down. I filtered countries with more than 1 million inhabitants.

Software: LibreOffice Calc.