 <translate> The relevant sentence in the passage is: The competition has been held every four years since 1991, when the inaugural tournament, then called the FIFA Women's World Championship, was held in China. So, the answer is 1991. <yor> Ẹsẹ ọ̀rọ̀ tó wà nínú àyọkà náà ni pé: Ọdún mẹ́rin-mẹ́rin ni wọ́n ti ń ṣe ìdíje náà láti ọdún 1991, nígbà tí ìdíje àkọ́kọ́, tí wọ́n ń pè ní FIFA Women's World Championship nígbà yẹn, wáyé ní China. Nítorí náà, ìdáhùn náà ni 1991. 