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_2268216_1 (year VARCHAR, average_speed__mph_ VARCHAR)

### Question ###
In what year was the average speed 92.68?

### Accurate SQL ###

SELECT year FROM table_2268216_1 WHERE average_speed__mph_ = "92.68"