user: Question: What is the average number of bronze medals for Total of all nations?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 10.0, 4.0, 4.0, 18.0]
SQL:

assistant: SELECT AVG("Bronze") FROM "Table" WHERE "Nation" = 'Total';