user: ### NOW ANSWER:
Question: What is the Places amount of the United States Ranking 8?
Columns: ['Rank', 'Name', 'Nation', 'Points', 'Places']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Liudmila Belousova / Oleg Protopopov', 'Soviet Union', 104.4, 13.0]
SQL:

assistant: SELECT AVG("Places") FROM "Table" WHERE "Nation" = 'United States' AND "Rank" = 8.0;