Why? Quick google search shows that it is getting cheaper in the long term [1] [1] https://www.ers.usda.gov/data-products/chart-gallery/gallery/chart-detail/?

Why? Quick google search shows that it is getting cheaper in the long term [1] [1] https://www.ers.usda.gov/data-products/chart-gallery/gallery/chart-detail/?chartId=76967 https://www.ers.usda.gov/data-products/chart-gallery/gallery...