According to the "Major Exporters of Wheat Diagram" for 2020, who are the top 3 wheat exporting countries by total export volume in tons?

Diagram: "Major Exporters of Wheat in 2020 (Total Export Volume in Tons)"

Based on the diagram, the top 3 wheat exporting countries by total export volume in tons are:

1. Russia ($$37.3 million)
2. USA ($$26.1 million)
3. Canada ($$26.1 million)