CREATE TABLE table_43486 ("Venue" CLOB, "Location" CLOB, "Environment" CLOB, "Closed" CLOB, "Reason" CLOB)

What were the reasons that venues closed in the 1990s?
SELECT "Reason" FROM table_43486 WHERE "Closed" = '1990s'
SELECT "Reason" FROM "table_43486" WHERE "Closed" = '1990s'