user: Question: Which Year has a Competition of Commonwealth Youth Games?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2007.0, 'World Cross Country Championships', 'Mombasa , Kenya', '23rd', 'Junior race']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Competition" = 'Commonwealth Youth Games';