user: Question: What were the reasons that venues closed in the 1990s?
Columns: ['Venue', 'Location', 'Environment', 'Closed', 'Reason']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Charlotte Coliseum', 'Eagle Lake, Charlotte', 'Indoor arena', '2005', 'Replaced']
SQL:

assistant: SELECT "Reason" FROM "Table" WHERE "Closed" = '1990s';