How much did iceberg lettuce cost in 1980?

January 1980 $0.35 per pound February 1980 $0.37 per pound March 1980 $0.39 per pound April 1980 $0.57 per pound May 1980 $0.56 per pound June 1980 $0.46 per pound July 1980 $0.39 per pound August 1980 $0.40 per pound September 1980 $0.50 per pound October 1980 $0.44 per pound November 1980 $0.52 per pound December 1980 $0.48 per pound