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_67097 ( "Player" text, "Years" text, "Games played" real, "Goals allowed" real, "Goals against average" real )

### Question ###
What is the average goals against average for those playing more than 78 games?

### Accurate SQL ###

SELECT AVG("Goals against average") FROM table_67097 WHERE "Games played" > '78'