user: Question: How many years have had the position of 2nd?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'World Race Walking Cup', 'Mézidon-Canon , France', '55th', '20km']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Position" = '2nd';