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Or the 1990s, or the 2000s, or the 2010s...

It's still a very popular thing for kids to doodle even today.

I did go to secondary school in the 1980s, but not in the US.

Or not American ?

How universal is it? It had made it's way to Australia by at least the early 90's.

Was also common in Ukraine in early 2000s.