user: Question: what is the average rank when the nation is east germany and silver is more than 1?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'East Germany', 2.0, 1.0, 0.0, 3.0]
SQL:

assistant: SELECT AVG("Rank") FROM "Table" WHERE "Nation" = 'east germany' AND "Silver" > 1.0;