ye monamicti. antaño. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 35v. col. 1. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
ye omonamicti = the more usual form of this idiomatic expression for "last year"