Export Sales for December 17-23, 2021. Wheat:  Net sales of 199,500 metric tons (MT) for 2021/2022 were down 53 percent from the previous week and 43 percent from the prior 4-week average.  Corn:   Net sales of 1,246,500 MT for 2021/2022 were up 27 percent from the previous week, but down 2 percent from the prior 4-week average.  Soybeans:   Net sales of 524,000 MT for 2021/2022--a marketing-year low--were down 35percent from the previous week and 56 percent from the prior 4-week average. Soybean Cake and Meal:  Net sales of 69,500 MT for 2021/2022—a marketing-year low--were down 77 percent from the previous week and 63 percent from the prior 4-week average.     Soybean Oil:&...