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Where did you get this "statistic"?
Just experience. Egg laying records, farm statistics exist from long ago. In the early 1900's, my grandparents kept flocks and records. An outstanding hen, back then, might lay 190 eggs per year. There were lots of reasons. The genetics weren't as focused as they are today. Feeding chickens was hit and miss. Poultry science was somewhat immature. Poultry feed? Some farmers fed their chickens with whatever they had, but others just let the chickens forage and pick spilled grains, etc as if they were virtually feral.
Again, as I said in my post, chickens here, up north, wouldn't even survive, let alone flourish if dependent on our local environment for 100% of their calories. The modern hen may have way more genetic potential for 250-280 egg production per year, but my concern would be this. Those same genetics actually seem to require better feed/vitamins/calcium/minerals to achieve. Your experience may differ and that's ok. Just my $.02