user: Question: What year was the rank final of 6?
Columns: ['Year', 'Competition Description', 'Location', 'Apparatus', 'Rank-Final']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2007.0, 'U.S. Championships', 'San Jose', 'Floor Exercise', '3']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Rank-Final" = '6';