user: Question: When was a report Not held?
Columns: ['Year', 'Driver', 'Constructor', 'Location', 'Report']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1998', 'Michael Schumacher', 'Ferrari', 'Buenos Aires No.6', 'Report']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Report" = 'Not held';