In 1980, 33.6% of Iowa corn was fed to Iowa livestock and poultry with 8.6% being used for non-ethanol corn products, 0.6% for ethanol, 10.4% was shipped to other states (mostly for feed use), 26.9% was exported to international markets, and 19.8% was held as ending stocks.

By 2023, those percentages had changed a lot. The latest estimates are that 21.0% of Iowa corn is used for feeding Iowa livestock and poultry, 7.8% is used for non-ethanol...