>>19829735afaik he was an edge case making a statement but I'd say late 80s till early 90s. nightrider with hasselhoff, miami vice, and all that made it popular. farmers and such held on a little longer, see wolfang petry. as a rule of thumb it we've always been a few years delayed from whatever happened in america.
in 1996 the mullet was mostly gone in the national team, but you can still see traces of it.
