Export Sales for December 10-16, 2021. Wheat:  Net sales of 425,400 metric tons (MT) for 2021/2022 were down 35 percent from the previous week, but up 11 percent from the prior 4-week average.  Corn:  Net sales of 982,900 MT for 2021/2022 were down 50 percent from the previous week and 29 percent from the prior 4-week average.  Soybeans:  Net sales of 811,500 MT for 2021/2022--a marketing-year low--were down 38 percent from the previous week and 42 percent from the prior 4-week average. Soybean Cake and Meal:  Net sales of 300,000 MT for 2021/2022 were up noticeably from the previous week and from the prior 4-week average.   Soybean Oil:  Net sales of 109,500 MT for 2021/2022--a marketing-ye...