Wheat:  Net sales of 330,400 metric tons for 2018/2019 were down 25 percent from the previous week and 38 percent from the prior 4-week average.   Corn:    Net sales of 877,400 MT for 2018/2019 were down 2 percent from the previous week, but up 50 percent from the prior 4-week average.   Soybeans:    Net sales of 680,500 MT for 2018/2019 were up noticeably from the previous week and from the prior 4-week average. Soybean Cake and Meal:    Net sales of 229,700 MT for 2018/2019 were reported for Mexico (53,100 MT), Colombia (35,300 MT, including 9,100 MT switched from unknown destinations), Ecuador (32,500 MT), Germany (32,100 MT, including 30,000 MT switched from unknown destinations)...