user: Question: The league of 400 (21) has what years listed?
Columns: ['Name', 'Years', 'League', 'FA Cup', 'League Cup', 'Europe', 'Other [C ]', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ryan Giggs', '1991–present', '664 (113)', '0 74 (12)', '0 40 0 (6)', '152 (23)', '0 19 0 (3)', '949 (157)']
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "League" = '400 (21)';