user: ### NOW ANSWER:
Question: How many years has Japan won silver?
Columns: ['Year', 'Location', 'Gold', 'Silver', 'Bronze']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1982.0, 'New Delhi', 'India', 'South Korea', 'Japan']
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Silver" = 'Japan';