Which preposition to use with nineties

in Occurrences 2%

This kingdom is also the kingdom of eternal realitiesor so at least it should be; and those who in the early nineties in England talked with Nizamoudhin (as he then was) could scarcely fail to notice that he valued the genius of an author, or the exploits of a character in history, chiefly in proportion to the permanent and vital nature of the truths this character had laboured to expresswhether in words or action.

of Occurrences 2%

These quotations have been intentionally taken from speeches, etc., published in the early nineties of the last century.

to Occurrences 1%

Then, with the peopling of Ontario by the United Empire Loyalists and the growth of the Maritime Provinces on the other side, Quebec could have entered Carleton's proposed Confederation in the nineties to her own and every one else's best advantage.

Which preposition to use with  nineties