Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_66 (singapore_gross VARCHAR, director VARCHAR)

### Question ###
For the directed by 1991, what was the gross in Singapore?

### Accurate SQL ###

SELECT singapore_gross FROM table_name_66 WHERE director = "1991"