As I understood девяностый is an adjective. All these are adjectives and are treated as adjectives.
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As I understood девяностый is an adjective. All these are adjectives and are treated as adjectives.
How I will say in Russia:
1. In 90s, 80s, 70s, / During 90s, 80s, 70s many important political events took place.
Also I found the expression in a book:
В этих романах писатель рассказал о...
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