user: Question: Tell me the year built for withdrawn of 1983
Columns: ['Class', 'Type', 'No. built (Converted*)', 'Year built (Converted*)', 'No. range', 'Withdrawn']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Class 420', '4Big', '18', '1965-66', '7031-7048', 1986.0]
SQL:

assistant: SELECT "Year built (Converted*)" FROM "Table" WHERE "Withdrawn" = 1983.0;