In what year was the world's first self-checkout system installed in a retail store?

The customer journey in retail has been transformed by numerous technological innovations over the decades. One of the most impactful changes to the in-store experience was the introduction of self-checkout technology, which dramatically altered how customers complete their transactions. This invention reduced wait times, changed staffing models, and gave shoppers more control over their shopping experience. But do you know when this revolutionary technology first appeared in retail stores?

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1992 (at Price Chopper in New York)
1986 (at Kroger in Cincinnati)
1998 (at Walmart in Arkansas)
2001 (at Tesco in the United Kingdom)