Export Sales and Shipments for April 14-20, 2023  Wheat:  Net sales of 155,700 metric tons (MT) for 2022/2023 were down 40 percent from the previous week and 7 percent from the prior 4-week average. Export shipments of 303,600 MT were up 50 percent from the previous week and 23 percent from the prior 4-week average.  Corn:  Net sales of 400,000 MT for 2022/2023 were up 28 percent from the previous week, but down 49 percent from the prior 4-week average. Export shipments of 1,076,300 MT were down 17 percent from the previous week, but up 7 percent from the prior 4-week average.  Soybeans:  Net sales of 311,300 MT for 2022/2023 were up noticeably from the previous week and up 38 percent from the prior 4-week a...