What is the 1991 when 1997 is 18?
CREATE TABLE table_name_26 (Id VARCHAR)
SELECT 1991 FROM table_name_26 WHERE 1997 = "18"
### Context: CREATE TABLE table_name_26 (Id VARCHAR) ### Question: What is the 1991 when 1997 is 18? ### Answer: SELECT 1991 FROM table_name_26 WHERE 1997 = "18"