user: Question: Which Position has a Competition of World Championships, and a Year larger than 1997?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1991.0, 'Pan American Games', 'Havana, Cuba', '1st', 'Heptathlon']
SQL:

assistant: SELECT "Position" FROM "Table" WHERE "Competition" = 'World Championships' AND "Year" > 1997.0;