user: Question: What is the total number of Year, when Bronze is "jamie stevenson"?
Columns: ['Year', 'Gold', 'Silver', 'Bronze', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2002.0, 'Michael Mamleev', 'Yuri Omeltchenko', 'Jamie Stevenson', '5.2km, 15controls']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Bronze" = 'jamie stevenson';