US Corn Yield 1980-2020 [pre] Bushels/acre 2020 180* 2010 153 2000 137 1990 119 1980 91 *USDA estimate; all-time best was 165 in 2009.[/pre]Source: http://www.reuters.com/article/2011/03/11/us-crops-usda-corn-idUSTRE72A6PO20110311