INFJs make up 2% of women and 1% of men
INFPs make up 1% of men
INTJs make up 1% of women
1% of the world's current population (7.7 billion) is 77,000,000 (77 million) people!
These statistics vary per country, ethnicity/culture, and generation, but whether it is 0.5% or 2% doesn't matter much.
Here is the article I mentioned that is all about me using (almost exclusively) quotes from other INFJ articles.