user: Question: What is the total number of years when mika miyazato won the silver?
Columns: ['Year', 'Location', 'Gold', 'Silver', 'Bronze']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'Beijing', 'Won Jae-Sook', 'Lee Jong-Im', 'Jamine Jose']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Silver" = 'mika miyazato';