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_70060 ( "Rank" real, "Circuit" text, "Headquarters" text, "Screens" real, "Sites" real )

### Question ###
what is the number of sites when the number of screens is 687 and rank is more than 7?

### Accurate SQL ###

SELECT AVG("Sites") FROM table_70060 WHERE "Screens" = '687' AND "Rank" > '7'