When did the general public start using vapor barriers?

I want to know because I'm wondering if my vapor barrier is an afterthought.
 
It was used at least 30 years ago
 
Then we are at the beginning of the 80s
 
It exists in my house which was built in 1972 (and it was not installed afterward).

If I had to guess, I think it started being used in the late '60s.
 
Thank you, then I can probably rule out that the moisture is coming from the inside.
 
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