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_203_438 ( id number, "year" number, "title" text, "role" text, "notes" text )

### Question ###
how many times is executive producer listed as the role in this chart ?

### Accurate SQL ###

SELECT COUNT(*) FROM table_203_438 WHERE "role" = 'executive producer'